Here is the full list of all 22 In Space We Brawl: Full Arsenal Edition achievements worth 1,000 gamerscore.
Complete 1000 fights.
Kill 250 players with the 'Plasma Sword'.
Collect 5 defensive pods at the same time.
Kill 50 players without using weapons.
Fire 500.000 shots.
Kill 2000 players.
Kill 4000 aliens.
Obtain 'Old School' badge 50 times.
Complete all weapon challenges.
Complete all ship challenges.
Play 100 mirror matches.
Complete 10 matches in less than 3 seconds.
Commit suicide 50 times.
Win 25 1 vs 3 matches.
Fight in every single sector of each location.
Complete all the 21 challenges.
Complete all the 21 challenges with S rank.
Kill 250 players with the 'Quantic Slinger'.
Unlock the 5th challenge.
Unlock the 10th challenge.
Unlock the 15th challenge.
Unlock the 21th challenge.