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