Here is the full list of all 36 Full Metal Furies achievements.
Complete the game (true end) on NG+
Unlock every piece of equipment for every Class
Air crit an enemy 5 times in a row
Unlock Cerby
Unlock every item in the Treasury
See the World
Defeat Titan King Prometheus
Complete all Class challenges
Find and translate all Monolith Stones in the Foloi Forest
Make a choice
Enter the Cave
Solve the Last Puzzle
Solve the Fourth Puzzle
Find All Monolith Stones in the Stygian Well
Solve the Second Puzzle
I always wanted a sibling
Solve the Third Puzzle
Find all Monolith Stones in the Desert of Atlantis
Find and translate all Monolith Stones in Thessaly
Solve the First Puzzle
Solve the Fifth Puzzle
Crack the code for at least 1 Computer
Find all Monolith Stones in Tartarus
Destroy the World
Defeat Planetar Cronus
Appease Ferryman Charon
Have 1 point in every skill for 1 Class
Defeat Sky Sniper Lelantos
Master a piece of equipment by reaching its max level
The synopsis looks grim
Defeat Land Fortress Coeus
Defeat Wavebreaker Meneotius
Unlock Go-Cat
Earn 1 level in your equipment
Unlock your first piece of equipment
Find your first Monolith Stone