Here is the full list of all 26 Rebel Galaxy Outlaw achievements.
Complete the Story Campaign
Complete Bountiful Vista Upgrades
Destroy 50 Capital Ships
Complete 5 Risky Jumps
Kill 1 Pirate Lord
Purchase Bountiful Vista
Claim 20 Bounties
Tractor 200 Objects
Destroy 200 Fighter Craft
Join the Mercenaries' Guild
Reach 1M Credits of Net Worth
Leave the Texas System
Meet Richter in Nacogdoches
Purchase a New Ship
Mine 20 Asteroids
Join the Merchant's Guild
Kill 5 Pirate Lords
Win 10 Games of Pool
Win 10 Games of Dice Poker
Earn the High Score at StarVenger
Destroy 1000 Fighter Craft
Destroy 120 Capital Ships
Shoot Down 100 Incoming Missiles
Reach 3M Credits of Net Worth
Complete 50 Mission Board Missions
Unlock All Buddy Characters