Here is the full list of all 49 Star Wars the Clone Wars: Republic Heroes (GFWL) achievements worth 1,000 gamerscore.
Finish the Prologue Mission: Master & Padawan
Finish all Jedi Missions as Ahsoka
Perform a Droid-Jak at the same time as your partner
Finish all Act 1 Missions on Padawan Difficulty
Finish all Act 1 Missions on Master Difficulty
Finish all Clone Missions as Cad Bane
Destroy 25 Droids by Jumping from Droid to Droid
Finish all Act 2 Missions on Padawan Difficulty
Finish all Act 2 Missions on Master Difficulty
Finish a mission with another Player
Destroy 25 droids while they are dancing
Finish all Act 3 Missions on Padawan Difficulty
Finish all Act 3 Missions on Master Difficulty
Finish a mission in co-op with a combined score of over 10000 points
Get at least a Bronze Medal for every challenge
Finish all missions with another Player
Get a Gold Medal for every challenge
Collect an Artifact
Collect 25 Artifacts
Collect 50 Artifacts
Buy a Hat or Mask
Buy all Combat upgrades
Buy all Droid-Jak upgrades
Buy all Droid Dancing upgrades
Defeat Kul Teska on Behpour without either player dying
Buy every Hat & Mask
Get a Gold Medal on a Jedi Mission
Get a Gold Medal on a Clone Mission
Get a Platinum Medal on a Jedi Mission
Get a Platinum Medal on a Clone Mission
Get over 250 points while controlling a single droid
Destroy over 100 droids with Droid-Jaks
Get over 100 points while controlling each type of Droid
Finish all Jedi missions as Anakin & Ahsoka
Get a total score of over 200,000 points
Get a combined best time for all missions under 200 minutes
Destroy 5000 droids
Get a Gold Medal for every mission
Destroy 10 Droids with a rolling Destroyer
Destroy 10 Droids attacking your partner
Destroy 50 Droids with a mounted Force Kill
Push 50 enemies off an edge to their doom
Destroy 25 Droids by doing a jump attack off another character
Destroy 50 droids with a clone melee attack
Destroy 100 droids your partner has stunned
Destroy 20 droids with explosive props
Destroy a Gold Droid
Force Kill one of each type of Gold Droid
Destroy at least one droid with each Droid-Jak