Here is the full list of all 19 Super Hop 'N' Bop ULTRA achievements.
Play 100 Matchs
Play a Timed Match 10 Minutes Long or More
Play a Timed Match 30 Minutes Long or More
Play a Timed Match 60 Minutes Long
Play 50 Matches
Unlock Fatboi
Play 10 Matches
Win King of the Hill With the Loser not Having Scored Once
Play King of the Hill With 99 Lives
Play Capture the Flag With 99 Points
Win Capture the Flag With the Loser not Having Scored Once
Win a Timed Match With the Loser not Having Scored Once
Unlock Twinkle
Play a Deathmatch With 99 Lives
Win a Deathmatch With the Loser not Having Scored Once
Unlock the Final Platform
Unlock Mr. Skeltal
Unlock the Space Base
Play 1 Match