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