Here is the full list of all 42 Killing Room achievements.
Kill 500 enemies
Kill enemy while being trapped in Bear Trap.
Pick up 20 medkits.
Take 5 rare items.
Die 10 times.
Take 5 legendary items.
Take 20 items.
Take 3 legendary items.
Complete 25 rooms.
Cover otherwise deadly hit.
Kill Duna Boss.
Kill 1000 enemies.
Kill 2000 enemies.
Take 50 items.
Take 10 rare items.
Die 50 times.
Finish the game with at least 10 Trouble items in inventory.
Win Killing Room.
Win Killing Room 5 times.
Save 5 ducklings.
Save 20 ducklings.
Solve 10 puzzles.
Solve 50 puzzles.
Open 10 coffins.
Open 50 coffins.
Pick up 100 medkits.
Max your Damage stat.
Max your Health stat.
Max your Stamina stat.
Max your Accuracy stat.
Max your Magazine stat.
Max your Speed stat.
Complete 250 rooms.
Complete 1000 rooms.
Kill 10 boss creatures.
Kill 50 boss creatures.
Kill yourself in Suicide Booth.
Kill 5 ducklings.
Kill 20 ducklings.
Get one item from real viewers.
Solve puzzle in last 5 seconds of countdown.
Win game on Hard mode.