Here is the full list of all 66 Evertried achievements.
Unlock All Achievements
Unlock every Skill, Skill Upgrade, Enemy and Boss entry in the Towerpedia
Achieve Final Mastery with all Skills
Reach Floor 100 in Endless Mode
Tame every enemy in the game at least once
Beat the game on Hard Mode
Finish the game without acquiring any items or destroying Forskydda
Spare Naskalla
Slay Naskalla
Defeat Naskalla, The God of Order
Reach Floor 51 in Endless Mode
Clear a floor in under 15 seconds or less
Change skills 3 times on one floor with Wild Conjuration
Kill 3 enemies with a Turret on the same floor
Successfully Transmutate 4 enemies on 1 floor
Tame 3 enemies on 1 floor
Deal 2 damage to a single unit during a single turn using Trap
Move 13 tiles in 2 turns
Heal 2 Masks on 1 floor
Make 3 enemies die from a Curse with a single cast of Curse
Pull 4 enemies with a single Converge
Chain 5 enemies with a single Chain Lightning
Warp from the farthest edge of a floor to another (the farthest distance possible)
Kill the last enemy of a floor using Roulette
Activate Roulette 3 times on the same floor without dying
Meditate on the first turn without taking damage
Dodge 3 attacks in a single turn
Push an enemy into a hole with Heavy Swing
Hit 3 Enemies with a single Divine Blade
Use Disperse to damage an enemy
Kill an enemy on the same turn it hit your decoy
Hit 4 Enemies with a single Bomb
Use an Ice Pillar or Ice Wall to block incoming damage
Buy everything in a shop
Defeat The Wanderer
Acquire an Ultimate Skill
Destroy Forskydda
Survive Forskydda
Clear a floor using only Hazards
Enter Hard Mode
Enter Endless Mode
Meet every NPC
Find a Secret Floor
Defeat Ilskgar
Defeat Avsladi
Complete the Tutorial
Master the Disperse Skill
Master the Divine Blade Skill
Master the Bomb Skill
Master the Ice Pillar Skill
Master the Light Feet Skill
Master the Decoy Skill
Master the Meditate Skill
Master the Warp Portal Skill
Master the Heavy Swing Skill
Master the Roulette Skill
Master the Curse Skill
Master the Thunder Orb Skill
Master the Turret Skill
Master the Healing Rune Skill
Master the Wild Conjuration Skill
Master the Tame Skill
Master the Grappling Hook Skill
Master the Transmutation Skill
Master the Converge Skill
Master the Trap Skill