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