Here is the full list of all 30 Seal: WHAT the FUN achievements.
Participate in any round
Participate in round 2
Participate in round 3
Acquire an item within the field and use it
Make it through any round
Make it through round 1
Make it through round 2
Make it through a race round
Make it through a score round
Make it through a survival round
Make it through a capture the crown round
Make it through a elimination or survival round
Make it through a team round
Win a match
Place within the top 3 in round 1
Place first in round 1
Place first in round 2
Place first in round 3
Place first on your team in a score round: team play
Complete a daily challenge
Complete a weekly challenge