Here is the full list of all 29 forma.8 achievements.
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
Reunite the alien family
Escape the energy swarm
Unlock access to the Lost Temple
Reactivate your Turbo
Kill the Corrupted forma
Reactivate the Mini Turbo upgrade
Beat the Fire Plant
Find the first artefact
Reactivate your Bomb
Find the first Energy Flower
Find the first Secret Object
Reactivate your Shield
Defeat the Evil forma
Find the lost forma
Find the Futuridium ship
Find all Energy Flowers
Reactivate the Dual Bomb upgrade
Reactivate the SuperShield upgrade
Reactivate the Enhanced Cooldown upgrade
Return to the Mysterious Island by night