ovr_Achievements_AddCount Function
Add 'count' to the achievement with the given name. This must be a COUNT achievement. The largest number that is supported by this method is the max value of a signed 64-bit integer. If the number is larger than that, it is clamped to that max value before being passed to the servers. ovrMessage_Achievements_AddCount will be generated in response.
ovrRequest ovr_Achievements_AddCount(const char *name, unsigned long long count)
count: unsigned long long
The value of count that will be added to the achievement.