Here is the full list of all 16 Pineapple on pizza achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Get out of the island.
Jump from the cliff.
Ruin the limbo.
Approach the skilled dancer.
Approach the turtle.
Approach the baby.
Activate the volcano.
Approach the cliff.
Approach the man feeding the birds.
Approach the bench.
Step inside the circle.
Approach the kids playing.
Walk through the corn plantations.
Step onto a sailboat.
Approach the statue.
Play.