Here is the full list of all 23 Fight for Gold II achievements.
Beat Maro E. Bumbler
Beat Chia-Long
Beat Lau-tua-e
Beat former Final Boss
Beat Final Boss
Clear Mini Game #1
Clear Mini Game #2
Clear Mini Game #3
Clear Mini Game #4
Beat the game as Siquapi
Beat the game as Rojo Quetza
True Ending of Siquapi
True Ending of Rojo Quetza
Easter egg of Siquapi #1
Easter egg of Rojo Quetza #1
Easter egg of Siquapi #2
Easter egg of Rojo Quetza #2
Easter egg of Siquapi #3
Easter egg of Rojo Quetza #3
Easter egg of Stage 4
Beat the game without death
A Player dies for ten times when playing the game
Get "S" rank when beating the game