Here is the full list of all 46 Smash Dungeon achievements.
Kill 1000 Chickens
Kill the Mech Boss
Kill 100 Giants
Kill 100 Ghosts
Kill 50 Evil Overlords
Kill 250 Evil Watchers
Kill 500 Mutants
Destroy 250 Mechs
Kill 100 Butchers
Kill 5000 Skeletons
Kill 50 Slayers
Destroy 500 Spawners
Kill 500 Spiders
Kill 50 Trolls
Get 500 kills using Shield Toss
Get 500 kills using Ground Slam
Get 500 kills using Whirlwind
Get 500 kills using a Power Arrow
Get 5000 kills using a Sword & Shield
Get 5000 kills using a Bow and Arrow
Get 5000 kills using a hammer
Get 5000 kills using dual swords
Get 1000 kills with a torch
Kill 1000 stunned enemies
Kill 1000 enemies stuck in slow puddle
Kill 1000 frozen enemies
Find 100 secret rooms
Save 100 Wizards from certain doom
Summon creatures in 100 rooms
Place 500 Towers
Eat food 1000 times
Achieve maximum weapon boosts
Strike 5 enemies with a single chain lightning attack
Reach maximum Blood-lust
Use a Smelter to Upgrade Armour or Weapon
A second chance at life by performing Death Defiance
Die in Lava
Die by Mutant explosion
Die by impaling on a spear trap
Destroy 5000 Vase