Here is the full list of all 21 Rollerdrome achievements.
Finish your first Match
Play through and finish the Entry Tests
Reach the Quarters
Reach the Semis
Reach the Final
Complete the main Campaign
Finish a Match without taking any damage
Complete 50% of the Challenges in the main Campaign
Complete 100% of the Challenges in the main Campaign
Finish a Match in a single Combo
Perform a single Combo worth more than 3,000,000
Finish a Match in the Out For Blood Campaign
Finish every Match in the Out For Blood Campaign
Complete 100% of the Challenges in the Out For Blood Campaign
Beat the Spider Tank Mk. I without taking any damage
Eliminate 2 House Players with a single Z-11 shot
Eliminate 3 House Players with a single Grenade
Finish a level using only Slug Shots
Complete every Tutorial exercise
Perform every Grab Trick in a single Match
Perform every Grind in a single Match