Here is the full list of all 12 Avium achievements.
You've collected 5/5 of the Lucifer, Ryujin, Loki, Ra, and Promethean Components! A total of 25 components! Your War-Suit is now spec'd out for Space travel. Try flying up out of the map now!
You've found 2 Rare Weapons!
You finished the game!
You've slain the Enforcer!
Used a Take Down for the first time!
Fool a GAMMA Officer!
Beat the gold record in Financial Speedway!
Beat the gold record in Slippity Slide!
You found all 5 Loki Components! Now you have Teleportation!
You found all 5 Ra Components! Now you have Laser Vision!
You found all 5 Lucifer Components! Now you can blend in with SONI Droids!
You found all 5 Ryujin Components! Now you can look like Gary at the start of the Story!