Here is the full list of all 37 Steredenn achievements.
Dies 50 times.
Pick all weapons at least once.
Pick all Heavy weapons.
Destroy a Battleship boss.
Destroy 100 cargos.
Kill a spy with the flamethrower.
Pick all Bots weapons.
Kill 2500 fighters.
Destroy a Carrier boss.
Destroy the Garbage Collector.
Pick all Melee weapons.
Destroy the Super Chabal.
Destroy a Cruiser boss.
Kill 1000 enemies.
Kill 500 fighters.
Destroy a Destroyer boss.
Kill 250 enemies.
Destroy a Frigate boss.
Pick 15 differents weapons.
Kill 50 enemies.
Destroy a Bomber boss.
Kill 10000 fighters.
Meet the Mothership.
Destroy the Mothership.
Destroy the Nemesis.
Pick all Energy weapons.
Pick all Bullets weapons.
Finish the game once.
Finish the first loop.
Defeat all the bosses in the Arena at least once.
Try all upgrades.
Beat the game using the Blaster only.
Destroy the Alien ship.
Destroy the Old Friend.
Destroy the Astroworm.
Beat the Red Baron
Complete a boss rush.