Here is the full list of all 30 forma.8 achievements worth 1,000 gamerscore. It takes around 12-15 hours to unlock all of the achievements on Xbox One.
Unlock all other achievements
Defeat the Evil forma
Find all Energy Flowers
Reactivate the SuperShield upgrade
Reactivate the Enhanced Cooldown upgrade
Find the Futuridium ship
Discover the Wrecked Ship
Reach the Dystopian Fortress
Open all passages
Gain the disguise skill
Defeat the Wrecked Titan
Reactivate your Teleport
Find the depleted Energy Source
Destroy the Guardian Turret
Find 25 artefacts
Reactivate the Dual Bomb upgrade
Find the lost forma
Return to the Mysterious Island by night
Reactivate the Mini Turbo upgrade
Unlock access to the Lost Temple
Reunite the alien family
Escape the energy swarm
Reactivate your Turbo
Kill the Corrupted forma
Beat the Fire Plant
Reactivate your Bomb
Find the first artefact
Find the first Energy Flower
Find the first Secret Object
Reactivate your Shield