Here is the full list of all 42 Killing Room achievements.
Kill 2000 enemies.
Kill Duna Boss.
Complete 250 rooms.
Max your Accuracy stat.
Kill 1000 enemies.
Kill 10 boss creatures.
Take 50 items.
Kill yourself in Suicide Booth.
Save 5 ducklings.
Kill 500 enemies
Pick up 20 medkits.
Kill enemy while being trapped in Bear Trap.
Die 10 times.
Take 20 items.
Max your Health stat.
Take 5 legendary items.
Take 10 rare items.
Cover otherwise deadly hit.
Complete 25 rooms.
Take 3 legendary items.
Take 5 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 20 ducklings.
Solve 10 puzzles.
Solve 50 puzzles.
Open 10 coffins.
Open 50 coffins.
Pick up 100 medkits.
Max your Damage stat.
Max your Stamina stat.
Max your Magazine stat.
Max your Speed stat.
Complete 1000 rooms.
Kill 50 boss creatures.
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.