There is a hint section at the end of the list saying:
Hint: Some achievements are mutually exclusive and determined by the unique ways you choose your story progression. Much in the same way your choices will lead to benefits and drawbacks, they will lead to different achievements.
Followed by a list of blocked off achievements, which contains three items:
- Must. Loot. Everything! - you didn't take the corpse and coconuts from the island, before crossing the tuneshark's waters.
- Deadly tune - the tuneshark killed you.
- RIP and try again - you died during your first night.
The new quest is as it follows:
"This island hides a lot of buried treasures, including some I put there myself!"
Goals:
- create a dirt totem. 0/1
- use a dirt totem to dig a hole. 0/1
- follow the map until you reach the area with buried treasure. 0/1 - there is a thermometer and the word "COLD" next to this line.
- find the buried treasure. 0/1
Hint: you might need an average dirt totem or several smol dirt totems to dig up a treasure, but you can just will it to "dig up nearby treasure" and it will work as long it is in range.
If she hurries, she can probably visit both the cave and the buried treasure and come back before nightfall, but only barely.