Besides gaining reputation with your questions and answers, you receive badges for being especially helpful. Badges appear on your profile page, flair, and your posts.
Question favorited by 100 users
Question score of 100 or more
Asked a question with 10,000 views
Answer score of 100 or more
Highest scoring answer that outscored an accepted answer with score of more than 10 by more than 2x
Provided answer of +20 score to a question of -5 score
Zero score accepted answers: more than 10 and 25% of total
Visited the site each day for 100 consecutive days
You must have a total score of 1000 in at least 200 non-community wiki answers to achieve this badge.
Raised 500 helpful flags
Edited 500 posts
Voted on 600 questions and 25% or more of total votes are on questions
Shared a link to a question that was visited by 1000 unique IP addresses
Earned 200 daily reputation 150 times