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