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