Here is the full list of all 30 Slasher's Keep achievements.
Re-enter Slasher's Keep
Escape Slasher's Keep
Complete the northerner storyline
Escape a small dungeon
Find the lucky monkey paw
Escape the gauntlet
Complete a quest
Escape the prison
Craft an item
Defeat the giant spider
Find a secret
Complete the amazon storyline
Complete the demon storyline
Complete the jellyman storyline
Complete the sasquatch storyline
Complete the undead storyline
Escape a medium sized dungeon
Escape a deep dungeon
Escape a frightening dungeon
Escape a marathon sized dungeon
Escape an infernal dungeon
Enter an infinite dungeon
Find the jade monkey
Satisfy the god of blood
Let yourself be consumed
Save Ava
Kill Bindrick
Eat 50 critters
Escape a large dungeon.
Use a prisoner chute.