Here is the full list of all 12 INVERSUS achievements.
Play a game on every map in versus mode.
Play 100 games in versus mode.
Play your first game in versus mode.
Play your first game in arcade mode.
Get a 10x chain hit in arcade mode.
Earn an extra life in arcade mode.
Get a 5x multiplier in arcade mode.
Get the maximum multiplier in arcade mode.
Play a game on every map in arcade mode.
Play 100 games in arcade mode.
Earn the maximum number of lives in arcade mode.
Get a 20x chain hit in arcade mode.