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