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