There are a maximum of 27 Halfway achievements worth 670
61 tracked gamers have this game, 2 have completed it (3.28%)
Complete all optional missions in one single play-through (progress resets when starting a new game).
Unlocked by 4 tracked gamers (7% - TSA Ratio = 3.90)
Do you have a question about this achievement? Please post it in the Halfway Forum