Here is the full list of all 28 GIGA WRECKER achievements.
Defeated Astra Saramā in Sattva, City of Decadence.
Defeated Astra Vinatā in Samsāra, Bloodsteel Arsenal.
You destroyed a lot of terrain.
You found a blueprint data which changes the design of a weapon.
You collected gate keys and opened an Area Gate.
You have upgraded your ARCHE ability and can use the Debris Blade.
You unlocked a skill.
You have upgraded your ARCHE ability and can use the Debris Lock.
Defeated Astra Kadrū in Darshana, Temple of Seekers.
Defeated Astra Rāhu and Ketu in Pātāla, Diamond Gate of Dragons.
Defeated Mahāstra Tārā in Vimukti, Fortress of the Flying Nymphs.
You have upgraded your ARCHE ability and can use the Debris Javelin.
You have upgraded your ARCHE ability and can use the Debris Drill.
You destroyed 10 enemies using the Debris Lock.
You destroyed 20 enemies using the Debris Blade.
You destroyed 10 enemies using the Debris Javelin.
You destroyed 20 enemies using the Debris Drill.
You destroyed 50 enemies using stage gimmicks.
You destroyed 30 enemies by crushing them with terrain.
You destroyed more than 8 enemies almost at the same time.
You destroyed an enemy with a Debris Lock dropped from more than 10 meters above it.
You cut down terrain with the Debris Blade, and destroyed 5 enemies with it almost at the same time.
You destroyed an enemy with a Debris Javelin shot from more than 20 meters away from it.
You digged through terrain more than 30 meters with a single Debris Drill.
You found all blueprint data and collected all weapons.
You unlocked all skills and became a perfect cyborg.
You collected all gate keys and opened all Area Gates.