Here is the full list of all 12 Disc Jam achievements.
Win a match as Stanton.
Win a Doubles match.
Complete the Advanced Tutorial.
Win a Singles match.
Win a match as Gator.
Score a point off of a serve.
Complete the Basic Tutorial.
Win a match as Makenna.
Win a match as Haruka.
Win a match without losing a single rally.
Score the final point of a match using a Super Throw.
Win 50 online public matches.