NCsoft has announced that due to abuse of a new system in City of Heroes, many achievements or 'Badges' are being removed.
The new Mission Architect system in CoH allows players to make their own content and share it with others. However, it didn't take long for people to develop scenarios that could be 'farmed', i.e. replayed over and over for experience points, rewards and Badges.
If it was just a few people then they wouldn't care. You log in to the game now and everyone from level 1 to level 50 "LF AE team" "AE team LF 2 more" "AE farm team starting"