Here is the full list of all 43 Deflection Dimension achievements.
Found all the powerups
Spend a minute in a room without dealing or taking damage
Die 100 times
Die 500 times
Use a seed
Killed 1 of every enemy
Make it to the top 10 on the leaderboard
1st place on the leaderboard
Complete 100 puzzles
Traverse 50 floors
Traverse 100 floors
Traverse 1000 floors
Defeated the first boss
Defeated the second boss
Defeated the first boss without taking damage
Defeated the second boss without taking damage
Killed 500 blue Slimes
Killed 500 Ghosts
Killed 500 Skeletons
Killed 500 Knights
Killed 500 yellow Slimes
Killed 500 Spiders
Killed 500 Wasps
Killed 500 Snakes
Killed 100 Reapers
Killed 100 Queen Bees