Here is the full list of all 50 Super Alloy Ranger achievements.
Beat the game on Normal Mode
Beat the game as Kelly
Obtain 15 secret disks in one mission
Defeat Alpha without destroying her support Android
Defeat No.Unique ASAP
Defeat the Fortress Giant Prototype without destroying the mecha hands
Score over 100,000 points in one level
Defeat the giant submersible without getting into water
Obtain a health capsule
Finish a level in one attempt
Finish a level with the highest evaluation
Obtain a special weapon
Obtain a secret disk
Beat The Sunken City & Obtain all Energy Points
Beat The Deep Frozen & Obtain all Energy Points
Beat The Abyss & Obtain all Energy Points
Beat The Infinite Train & Obtain all Energy Points
Beat The Fortress & Obtain all Energy Points
Beat The Paradox Coordinate & Obtain all Energy Points
Beat & Obtain all Energy Points
Beat the game on Super Mode
Beat the game on Crazy Mode
Beat the game as No. 02
Obtain all special weapons in one game
Obtain 10 health capsules in one game
Obtain all secret disks in one mission
Collect all energy points in one level
Finish a level unharmed
Finish a level in less than 5 minutes
Finish a level with the highest evaluation under Crazy Mode
Finish a level with the lowest evaluation
Defeat the giant aircraft without jumping
Defeat the Battle Fortress before reaching the destination
Destroy 5 bombs from the giant airship in one combat
Defeat the BioComputet without destroying the organic crystal block
Finish the fight without attacking No.Unique
Let Guagua break15 ice breaks in one fight
Let Secret Hale 1999 use explosive lightening 5 times in one fight
Defeat Beta without getting hit
Defeat Code:Zero without being hit by its triangular energy crystal
Find & Destroy the Fusion Android
Finish a level with 1 HP left
Being in air for a long period of time
Read all the hidden notes in all secret disks, too sad that none of the characters can decode the past
Unlock all achievements; Thanks for playing!