First, you need a level 3 workshop. Then you need the following elements in order:
- 3x Meat (Level 1 Paddock) -> Iron Ore
- 2x Iron Ore (Level 2 Mine) -> Metal
- 1x Metal (Level 2 Smeltery) -> Nails
You need to make 50 nails for the achievement.
You can also randomly get this achievement just by visiting an other player's world.
You can visit your friends who have the game or the members of your clan by clicking on the social button on bottom right of the screen.
To join a clan, you must have built the Clan Tower which unlocks at level 18.
Note : Coliseum events allow you to visit unknown players' worlds (click on the event logo under your crytals, Individual and Top players).