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

First bounty you manually awarded on another person's question
22 awarded
First bounty you manually awarded on your own question
46 awarded
Asked a well-received question on 5 separate days, and maintained a positive question record
201 awarded
First bounty you offered on another person's question
29 awarded
Question score of 10 or more
2.1k awarded
Asked a question with 1,000 views
2.6k awarded
First bounty you offered on your own question
74 awarded
Asked a question and accepted an answer
2k awarded
Asked first question with score of 1 or more
5k awarded
Asked a question with zero score, no answers, no comments, and low views for a week
29 awarded

Answer Badges

Edited and answered 1 question (both actions within 12 hours, answer score > 0)
90 awarded
Answer score of 10 or more
3k awarded
Answered more than 30 days later as first answer scoring 2 or more
279 awarded
Answered your own question with score of 3 or more
193 awarded
Answered first question with score of 1 or more
3k awarded

Participation Badges

Completed "About Me" section of user profile
6.7k awarded
Visited an election during any phase of an active election and had enough reputation to cast a vote
229 awarded
Left 10 comments
568 awarded
Earned at least 200 reputation (the daily maximum) in a single day
97 awarded
Followed the Area 51 proposal for this site before it entered the commitment phase
39 awarded
One post with score of 2 on meta
202 awarded
Posted 10 messages, with 1 or more starred, in chat
60 awarded

Tag Badges

You must have a total score of 100 in at least 20 non-community wiki answers to achieve this badge.
184 awarded

Moderation Badges

First flagged post
606 awarded
First rollback
52 awarded
First down vote
564 awarded
Completed at least one review task. This badge is awarded once per review type
540 awarded
Deleted own post with score of 3 or higher
37 awarded
First edit
2.1k awarded
Edited first post that was inactive for 6 months
137 awarded
First retag
198 awarded
Deleted own post with score of -3 or lower
43 awarded
Approved or rejected 100 suggested edits
16 awarded
Used 30 votes in a day
87 awarded
First up vote
5.1k awarded
First approved tag synonym
11 awarded
First tag wiki edit
105 awarded
Used the maximum 40 votes in a day
49 awarded

Other Badges

Visited every section of the FAQ (retired)
136 awarded
Shared a link to a question that was visited by 25 unique IP addresses
263 awarded
Read the entire tour page
820 awarded