Casualties: Unknown has 40 achievements to unlock, including story progression, survival challenges, gameplay tasks, and hidden achievements. Some are tied to specific endings, while others require you to complete certain actions or reach particular conditions during a run.
This guide covers all 40 Casualties: Unknown achievements and explains how to unlock them. I’ve also included the solutions for secret achievements that were previously unclear.
Note: This guide contains story and ending spoilers.
Casualties: Unknown Progression Achievements
These achievements are tied to completing missions, reaching specific layers, and unlocking different endings.
1. Company’s Best
Description: Complete the mission.
Complete the game with the chip and reach the Bio-pod ending to unlock this achievement.
2. Millions to One
Description: Obtain the cargo.
Reach Layer 10 and complete the objective to obtain the cargo.
3. Consolation Prize
Description: Over halfway there.
Reach Layer 5 or Layer 6. I forgot the exact layer requirement, but progressing past the halfway point should unlock it.
4. Cannon Fodder
Description: Finish a run as an Experiment.
Complete a run while playing as an Experiment. Any ending counts.
Unlocking this achievement also unlocks the Milky character.
5. The Marksman
Description: Finish a run as a Milky.
Complete a run as Milky. You can reach any ending to earn the achievement.
Unlocking it also gives you access to Dune.
6. The Cannibal
Description: Finish a run as a Dune.
Complete a run while playing as Dune. Any ending will count.
7. Company’s Worst
Description: Get your freedom.
You need to reach the Escape ending.
Follow these steps:
- Start an unchipped run.
- Bring a gun with you to the lab.
- After the scientist finishes talking, kill them.
- Escape from the lab.
This will trigger the Escape ending and unlock the achievement.
8. To Be Continued…
Description: Fail the mission. Catastrophically.
Unlock the Mercenary ending to earn this achievement.
Requirements:
- Complete either the Bio-pod or Escape ending at least once.
- Start a chipped run.
- Bring a gun to the lab.
- Craft the M.E.R.C. scarf and carry it to the surface.
How to craft the M.E.R.C. scarf
First, leave the life-pod and head down to find a Tech-Ball. Break it to obtain the Nano-tech scanner.
Pick up the scanner before leaving Layer 1 and keep it in your inventory throughout the run. It will help you locate the six required chips.
Collect these chips from the following layers:
| Layer | Required Chip |
|---|---|
| Layer 2 | REL-Hyper-Regeneration Booster chip |
| Layer 3 | Micro-SINGLEBTR 1CHRG capacitor |
| Layer 4 | 0.2.9-Mind-Swap chip |
| Layer 5 | 0.0.7-Emergency Rejuvenation chip |
| Layer 7 | MINI-AI chip |
| Layer 9 | Kinetic Transmitter chip |
Once you have all six chips, craft the M.E.R.C. scarf using:
- 1 Scarf
- 1 Circuit board
- All 6 required chips
The recipe requires 18 INT.
After crafting it, keep the M.E.R.C. scarf in your inventory and reach the surface. This will unlock the Mercenary ending and the achievement.
Casualties: Unknown Challenge Achievements
These achievements require specific survival conditions, combat victories, skill levels, or other difficult tasks.
9. TOP OF THE FOOD CHAIN
Description: Become the apex predator.
Kill the Elder Thornback boss in the Overgrown Depths.
Using two Dynamites is one of the easiest ways to take it down.
10. Survival Veteran
Description: Reach level 16 in each skill.
Raise every skill to Level 16.
An Endless run may be a good way to work toward this achievement since it gives you more time to improve your skills.
11. Not a Care in the World
Description: Reach max. happiness.
Increase your happiness until it reaches the maximum level.
My preffered method is to find a Mini-barrel containing Fentanyl and consume it.
12. Leukocyte Overflow
Description: Have 200% immunity.
Increase your immunity to 200%.
Look for a Mini-barrel containing Antibiotics and consume them to raise your immunity.
13. In and Out
Description: Beat the game in under 3 hours (In-game time).
Finish the game before the in-game timer reaches three hours.
Use Drill Pods to skip certain layers and save time during your run.
14. Lightfooted
Description: Complete a layer without ragdolling from a fall once.
Finish an entire layer without ragdolling due to fall damage.
Layer 1 is a good place to attempt this. Move carefully and avoid jumping or falling from dangerous heights.
15. Heavy Metal
Description: Smelt a titanium slab.
Craft a Titanium Slab using the following materials and item qualities:
- Ilmenite chunk
- 50 mL Bio-chem fluid
- Any item with Hammering quality
- Any item with Cutting quality
Smelt the Titanium Slab to unlock the achievement.
16. Certainty of Steel
Description: Have 4 P.E.O. limbs attached simultaneously.
Attach four P.E.O. limbs to your character at the same time.
You’ll need to gather several crafting materials before you can make them. The required materials are:
| Material | Quantity / Condition |
|---|---|
| Titanium slab | 1, at least 90% condition |
| Titanium sheet | 3 |
| Chunk of plastic | 2 |
| Circuit board | 2, at least 90% condition |
| Bundle of wires | 1, at least 90% condition |
| Any item with Nails quality | 1, at least 100% condition |
| Bio-chem fluid | At least 30 mL |
| Any item with Hammering quality | 1 |
| Any item with Cutting quality | 1 |
Gather these materials and craft the required P.E.O. limbs. Once four limbs are attached simultaneously, the achievement should unlock.
17. …
Description: Become hollow.
Use the Mindwipe item to become Hollow.
You may need to use Mindwipe when your brain health or mood is sufficiently low.
18. Center of Attention
Description: Have 6 manifestations active at once.
Manifestations are enemies found in the Crystalline Hollow layer.
Find an area where they spawn and get six of them active at the same time to unlock the achievement.
19. Pacifist
Description: Kill no guards during the escape sequence.
Complete the escape sequence without killing any guards.
Focus on running past them and reaching the exit. Avoid fighting, even when guards get in your way.
20. Round and Round We Go…
Description: Loop an endless run twice.
Start an Endless run and complete two loops to unlock this achievement.
Casualties: Unknown Gameplay Achievements
Most of these achievements are easier to unlock and require you to perform a particular action during gameplay.
21. Transhumanist
Description: The flesh is weak.
Replace your missing limbs with prosthetic limbs.
Once you have a missing limb, attach a prosthesis to unlock the achievement.
22. Playing With Fire
Description: It might come in useful…
Fire a shot from any weapon.
Find a weapon, equip it, and shoot once.
23. It Refused
Description: Let’s not give up just yet.
Trigger the Last Stand effect after dying.
You need to meet these conditions:
- Brain integrity must be 15% or lower, but above 0%.
- Consciousness must be below 30%.
Once both conditions are met, the Last Stand effect should activate.
24. Hoarder
Description: Achieve 100% overencumbrance (without minibarrels).
Collect enough items to reach 100% overencumbrance.
Keep picking up items until your character reaches the required weight limit. Mini-barrels do not count toward this achievement.
25. ‘Tis but a Scratch!
Description: Survive a bite from an Elder Thornback.
Let an Elder Thornback bite you, then survive for a couple of minutes afterward.
Avoid taking additional damage while recovering from the bite.
26. My Survival Over Yours
Description: They made you do it. That’s what you want to believe, anyway.
Kill another survivor to unlock this achievement.
27. Ain’t That a Kick to the Head
Description: Survive a gunshot wound to the head.
Get shot in the head and stay alive for a couple of minutes afterward.
Be careful not to take too much additional damage while waiting.
28. Neural Enhancement
Description: Use a neural booster.
Find a Neural Booster and use it.
29. Expected Outcome
Description: Another one to the count.
Die during a run to unlock this achievement.
30. Good as New
Description: Heal a fracture.
Use a splint to treat a fractured limb.
Once the fracture is healed, the achievement will unlock.
31. Graduate
Description: Finish all the training courses.
Complete every available training course in the game.
32. Express Route
Description: Use a Drill Pod.
Find a Drill Pod and use it to travel between layers.
You may need to craft a Drill repair kit before using the pod.
33. Dead Man Walking
Description: Restart a stopped heart.
Use an Automated External Defibrillator (AED) to restart your heart after it stops.
34. Thermal Camouflage
Description: Sneak past a turret through unconventional means.
Turrets react to warm temperatures, so you need to lower your body temperature before passing them.
Use QCold to cool your body, then sneak past a turret without getting detected.
35. Real Suck-Up
Description: Reach max. reputation with a survivor.
Build your reputation with any survivor until it reaches the maximum level.
Casualties: Unknown Secret Achievements
The following achievements are hidden and won’t reveal their unlock conditions until you earn them.
36. Bright Idea
Description: Really? You should know better!
Find a Light Bulb and put it inside your mouth.
This will unlock the achievement.
37. Level One Breach
Description: You can’t escape that easily.
Break the glass during the tutorial to earn this achievement.
38. Wrong Way
Description: You’re supposed to go down!
Start a new run and move upward instead of going down.
Keep moving until you reach and touch the invisible wall.
39. Reading Comprehension
Description: Hey! The screen turned on!
Find and use the E-PDA item that appears on the life-pods.
Using the E-PDA will unlock this achievement.
40. What Have I Done..?
Description: Take your anger out on a little friend.
Carry a Plushie in your inventory and enter the self-harm/suicide minigame.
Having the Plushie with you will automatically cancel the minigame and restore some of your mood, unlocking the achievement.
