Here is the full list of all 16 Amaranthine achievements.
Complete subwarp level
Complete game on normal
Sell 100 weapons
Ram 50 enemies
Destroy the battlecruiser
Destroy 5000 enemies
Reach 20 level on legend mode
Complete game on legend mode
Destroy 12 cargo ships in a single run
Destroy the bomb
Find legendary weapon
Destroy the overwatcher
Complete level without taking any damage
Destroy 1000 enemies
Destroy 250 enemies
Kill 10 enemies in 1 secon