Here is the full list of all 50 Galactic Arms Race achievements.
Find 10 Isotopes.
Kill 10 Super Elites.
Collect 100,000 Credits.
Die 10 Times.
Fill a squad with four players.
Collision full speed with another player.
Achieve maximum Isotope fitness.
Kill 100 Pirates.
Kill 1 Super Elite.
Kill 100 Aliens.
Kill 1 Blob.
Fire 1,000 shots.
Modify a weapon using the Weapons Lab.
Collect 10 Isotopes.
Kill 10 Aliens.
Kill 10 Pirates.
Kill 1,000 Pirates.
Kill 1,000 Aliens.
Kill 100 Super Elites.
Kill 10 Blobs.
Kill 100 Blobs.
Kill 1 Player.
Kill 10 Players.
Kill 100 Players.
Fire 10,000 shots.
Fire 100,000 shots.
Fire 1,000,000 shots.
Collect 100 Isotopes.
Find 100 Isotopes.
Collect 1,000,000 Credits.
Collect 10,000,000 Credits.
Die 100 Times.
Join a squad and kill a max level player.
Obtain level 100.
Obtain level 200.
Obtain double xp from a high level kill.
Get denied experience from trivial kills.
Kill something level 1,000 or higher.
Get killed by someone who is infected.
Obtain an Autonomous Drone.
Enter a PvP Zone.
Achieve Maximum Rank.
Win an arena match.
Kill an opponent while you are dead.
Achieve 100k Damage per second.
Kill a player less than half of your level.
Teleport or warp exactly onto another player.
Kill one Geonoid.
Kill ten Geonoids.
Kill 100 Geonoids.