Here is the full list of all 18 Oppaidius Desert Island! achievements.
The Ultimate Summon was cast during a beach volley match!
You made the breasts move with the power of your keyb-ehm, mind!
You recommended all the greatest masterpieces to Dan-dan!
Congratulations! You unlocked every beach volley minigame icon!
We had to have this achievement, otherwise no one would have seen the special art…
You unlocked every art in the game!
You have unlocked every special audio track!
You witnessed an incredible event that will pass into the annals of history…
“I never leave my TRAVEL BRACE behind…!”
It could have been better… You have to retry, amazing adventures await you!
You set the “boobage level” to 100!
You unlocked the Rika Ending!
You unlocked the Dan-dan Ending!
You unlocked the Angela Ending!
The one most loved by kids and adults makes a comeback!
You won a swimming race earning something “spicy”!
You won a beach volley match!
You began the adventure!