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