Here is the full list of all 16 Oppaidius Tropical Cruise achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
You saw the Angela without panties secret scene!
You unlocked every art in the game! Now check the gallery, a surprise could await you there…
You achieved Angela’s max level affection points!
You saw all the tic tac toe boxes’ scenes!
5 minutes in a row looking at the cleavage rubbing scene… will it be enough…? (Of course it is not)
Right, that’s the kind of “achievement” I didn’t need…
You set the “boobage level” to 100!
You surely are somebody’s type-you just need to hang in there!
You heroically resisted until the end…
You saw the VERY SCARY devs’ ghosts!
You remembered about that time, with the seagull…
You chose the wrong “shortcut”…
You achieved Rika’s max level affection points!
Look at those melons!
It’s the first time I’ve seen her smile…
You began the adventure!