Here is the full list of all 36 TinyKeep achievements.
Beat Level 5
Ascend to the overgrown surface
Release the horde
Sacrifice gold to the higher gods
Destroy your first crystal
Defeat the first boss
Disregard the principles of permadeath
Die the first time
Discover a treasure chest
Sacrifice gold to the gods
Find a Shield
Kill your first hostile
Find a Sword
Release your first prisoner
Complete the game without directly killing any enemies
Leave Maggie behind in the dungeon
Give your friend and ally what was coming to her
Complete the game without being hurt at all
Access the developer's office
Complete the game without using a shrine once
Complete the game without eating a single piece of food
Complete the game without a shield
Resurrect from the dead
Complete the game in New Game+ mode
Grace the dungeon with an air of elegance and sophistication
Find a use for that damn acid cauldron
Discover the hidden stash of gold
Discover the secret shop entrance
Deflect a magical projectile
Reach the Alternate Demonsion
Befriend a Baby Dragon
Incur the wrath of Maggie
Discover the Flaming Sword
Master the ability to bend time
Witness a Dungeon Party
Unlock the Final Weapon