Legendary_W on 02 July 2014
Depends on the game. Some games reward you for progressing towards 100%, others reward you for getting three headshots less than one sec. away from each other with a .44 Magnum while performing a double backflip passing through a ring of fire.
If the achievements are coherent, then yes, they are a great adittion. If you have to spend eight hours searching for 250 extremelly small hidden collectibles only worth for the achievement then no.
