Here is the full list of all 20 Survival: Fountain of Youth Playtest achievements.
Faint 10 times
Build a Chemistry Workbench
Catch a fish
Build a Kiln
Build a Water Collector
Find a Sea Resources
Kill a Jackal
Spend 10 hours in game
Build a Cart for transporting
Craft a bow
Kill a Boar
Find an Obsidian Shard
Find a Сlay Piece
Craft a Spear
Unlock 50 recipes
Spend 2 hours in game
Faint for the first time
Unlock 20 recipes
Kill a Turtle
Survive the shipwreck