Stranded Deep

This essentially apart of the introductory tutorial of the game when you land on the island.

Grab two rocks by pressing while looking at them (they are found scattered about on the beach), then once they are in your inventory hit to pull up your crafting menu. The top option is "stone tool," simply hit to craft stone tool and the achievement is yours.

Good luck!

This will be earned through the tutorial.

To craft a stone tool, all you require is a single rock. Rocks can be found lying on the ground.

Hold 'C' and choose the item to craft.