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