Here is the full list of all 18 Discs of Steel Party achievements.
Play 5 games in arena mode
Play 20 games in arena mode
Play 50 games in arena mode
Play 100 games in arena mode
Play 5 games in race mode
Play 20 games in race mode
Play 50 games in race mode
Play 100 games in race mode
Play 5 games in battle mode
Play 20 games in battle mode
Play 50 games in battle mode
Play 100 games in battle mode
Score a goal in less than 10 seconds
Finish a race without going out of track
Win a battle round when there is only one platform left
Look at the instructions
Change option settings
Play a 6 players game