The Playstation 4 has an in game reward system known as “Trophies”. This mechanic was a part of the PS3 and PS Vita and is also a part of the PS4. Just like achievements on the Microsoft platforms, trophies are awarded to players after they perform pre defined actions in a game. (e.g. Kill 100 enemies).
There are 4 different types of trophies. Bronze, Silver, Gold and Platinum. The different level of trophies are often awarded based on the difficulty of the task completed. Bronze being a particularly easy task and gold being a hard task, although this may not always be the case. Platinum trophies are awarded when all other trophies from the same game have been unlocked.