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 Badges

Question favorited by 100 users
28 awarded
Question score of 100 or more
31 awarded
Asked a question with 10,000 views
169 awarded

Answer Badges

Answer score of 100 or more
53 awarded
Highest scoring answer that outscored an accepted answer with score of more than 10 by more than 2x
65 awarded
Provided answer of +20 score to a question of -5 score
3 awarded
Zero score accepted answers: more than 10 and 25% of total

Participation Badges

Visited the site each day for 100 consecutive days. (Days are counted in UTC.)
665 awarded
Earned 200 daily reputation 150 times

Tag Badges

You must have a total score of 1000 in at least 200 non-community wiki answers to achieve this badge.
6 awarded

Moderation Badges

Raised 500 helpful flags
2 awarded
Served as a pro-tem moderator for at least 1 year or through site graduation
Served as an elected moderator for at least 1 year
Completed at least 1,000 review tasks. This badge is awarded once per review type
6 awarded
Edited 500 posts
1 awarded
Voted on 600 questions and 25% or more of total votes are on questions
104 awarded

Other Badges

Shared a link to a question that was visited by 1000 unique IP addresses
8 awarded