Aftermarket Junkie is an achievement or trophy (depending on your platform) in Far Cry 3. All you have to do is buy every attachment and paint job for a gun in the weapon shop. This can be done easily at the start of the game with the 1911, a pistol. There are no attachments and you can buy all these camo paint schemes for a total of $1200.
The sequel to the award winning Hellblade: Senua’s Sacrifice, Senua returns in a brutal journey of survival through the myth and torment of Viking Iceland. Intent on saving those who have fallen victim to the horrors of tyranny, Senua faces a battle of overcoming the darkness within and without.