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