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