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