ABZU is an underwater walking simulator
type game that takes approximately 1-3 hours. Completing the game will unlock this achievement, but everything else can be missed during your playthrough.
The game contains 51 collectibles as well, grouped as follows:
- 19 Sea Shells
- 12 Meditation Statues
- 20 Hidden Pools
The following video shows the entire game and all available collectibles and missable achievements in about 1 hour and 15 minutes.