Talk:Ghost/@comment-220.233.171.88-20130126024304/@comment-199.111.189.33-20130405205141

"Alerting" an enemy refers to a state in which they are aware of your presence and attempt to attack you. Otherwise they just get suspicious, but don't actually find you.

Also, as far as I know, only Weepers and human targets count against the achievements - rats, krusts, and even wolfhounds do not.