Here is the full list of all 25 Metaloid : Origin achievements.
Defeat Heavy Gunner
Defeat Bio Hazard
Defeat Magnetron Dyna
Defeat Grim Rush
Defeat Molten Monger
Defeat Ice Trumper in direct battle
Lure Ice Trumper jump to the pit
Defeat Cryo Maniac
Defeat Eradica Mk.II
Destroy All Reactor in fleet level without using Glora
Defeat Ubermind
Defeat Origin Titan
Defeat Origin Titan in hard difficult without using recovery power and Glora
Defeat Aeon in Sky ladder using Erika Flame kick
Find and defeat Aeon 4 times in different levels
Complete Game as Erika
Complete the game as Zeta
Complete the game as Neva
complete the game with all characters
Complete the game on Hard Difficult
Collect and unlock all upgrade as Erika
Collect and unlock all upgrade as Zeta
Collect and unlock all upgrade as Neva
Collect all big gem in the game
Kill enemy with bike kamikaze