Here is the full list of all 28 RUNGORE achievements.
Open the game for the first time
Turn off shader or screenshake
Complete the sword artifact
Buy keyboard controls in shop
Unlock Bow guy
Kill a boss while having 1 HP left
Kill Daddy Fractal
Complete true tutorial
Unlock Gun guy
BOOM
Сollect 100 cards in hand
Solve the panel code in the event
Kill lil frog
Kill Clippy in True tutorial
Buy communism
Kill a boss with low FPS
Kill Toxic guy in Swamp
Reach 0.0s attack speed
Use lag potion
Summon 100 creatures in a battle
Complete a level without playing cards
Complete a level with Bomb guy
Unlock all heroes
Play New Game +
Tutorial Completed
Complete Meat Pit alternative way
Complete each level with each character
Complete NG+