Cleanup
New achievements and some fixes
AchievementManager fix

AchievementManager instance passed to achievement update method
Achievement popup
Cleanup
Cleanup
Some achievements fixes
Update README.md
Update README.md
Update README.md
Update README.md
Some html cleanup
Silly bug fix
Achievements contributing guide initial
Update ACHIEVEMENTS.md
Cleanup
Merge remote-tracking branch 'origin/gh-pages'