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