Summary
I was trying to get achievements in Minecraft while signing in, in offline mode.After for about 40 seconds, the screen hang(freeze) and then I have to log out to play Minecraft without any hang. now it is so hard to get achievements

what I expected to happen was
playing the game without any hang screen while signing in, in offline mode

what actually happened was
after 40 seconds the game hang(freeze)

step to reproduce
1. sign in automatically in offline mode( no internet)
2. play the game to get achievements
3. the screen hang after 40 seconds