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