Just craft 10 different items from the crafting menu. These include consumables, costumes, artifacts and even story recipes. Just run around South Park, loot all you can and start crafting.
If you don't have enough recipes you can always buy more from most shops, and if you have Ubisoft Club the reward artifacts can be upgraded very easily if you have a high enough crafting level.
I've done a video guide as well if that helps.
Lets keep on cheevin' together!