Construct a pickaxe. 3 of any mineral and two sticks.
Wood would be the easiest to do this achievement with!
-Mine some logs (3 minimum)
-Open your inventory
-Craft the logs into planks. Use the 2 planks to craft sticks and 4 planks to craft a workbench
-Place the workbench
and then open the workbench
-Put two sticks up the middle column and three planks across the top row
-Craft the pickaxe