Here is the full list of all 14 Varion achievements.
Complete 6 areas in Arcade class
Complete 6 areas in Classic class
Complete 6 areas in Elite class
Complete 6 areas in Elite class scoring S only
Complete an area with at least 80% accuracy in each round
Complete an area without dying once
End a 10-or-more-rounds match without dying once
Lose a 10-or-more-rounds match without dying once
Perform 5 Dominators in one match
Perform 10 Backfires in one match
Destroy 100 bots in one match
Organize 10 battles
Organize 100 battles
Organize 500 battles