Here is the full list of all 10 Islet Online achievements.
Make a weak wooden pickax
Make 10 wooden arrows
Make a shortbow
Make a weak wooden shovel
Make a weak wooden sword
Find a fruit tree. And Get 10 fruit tree bricks
Make a weak wooden axe
get 10 pieces of meat
get 10 ruined Leather Scraps
A tool used to capture animals. Make 10 shoddy bolas in simple manufacturing table