Three. UC:DF, UC2 and Days Gone. They all had many trophies unlock naturally or by getting the in-game unlocks for UC1, so I only had a couple to do for the Plat and I felt like doing that. Uncharted 3, GA, 4 and LL have too many "ehh" trophies, especially MP ones, so I didn't feel like doing it there and with all other games I'm not even close.