Here is the full list of all 22 Star Wars: Droid Repair Bay achievements.
Complete a holo-gate course with a different Droid than you started it with.
Complete a holo-gate diagnostics course with a Droid.
Keep the NR-S3 Droids busy by dropping five good parts on the floor.
Throw a repair part into the air and catch it.
Complete a treadmill diagnostic with a Droid.
Complete BB-8's repair.
Save the day in the Repair Bay.
Don't leave G2-RX hanging.
Deliver each Droid to the repair table manually.
Say hi to a Droid by waving.
Pet a Droid while it's on the floor.
Complete all Droid repairs in a single playthrough.
Complete the holo-gate diagnostic for all four Droids in a single playthrough.
Complete the treadmill diagnostic for all four Droids in a single playthrough.
Complete both diagnostic activities with all four Droids in a single playthrough.
Don't drop any good parts during repairs.
Contribute to the junk pile.
Hit G2-RX in the head with a repair part while he's busy.
Socket a repair piece by throwing it into the Droid's guts.
Throw a part into the rim of the fallen gantry.
Catch a repair part delivered to you.
Catch every repair part delivered to you.