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
25 awarded
First bounty you manually awarded on your own question
132 awarded
Asked a well-received question on 5 separate days, and maintained a positive question record
214 awarded
First bounty you offered on another person's question
76 awarded
Question score of 10 or more
844 awarded
Asked a question with 1,000 views
5.1k awarded
First bounty you offered on your own question
302 awarded
Asked a question and accepted an answer
3.3k awarded
Asked first question with score of 1 or more
7.5k awarded
Asked a question with no votes, no answers, no comments, and low views for a week
1.4k awarded

Answer Badges

Edited and answered 1 question (both actions within 12 hours, answer score > 0)
79 awarded
Answer score of 10 or more
860 awarded
Answered more than 30 days later as first answer scoring 2 or more
769 awarded
Answered your own question with score of 3 or more
203 awarded
Answered first question with score of 1 or more
6k awarded

Participation Badges

Completed "About Me" section of user profile
19.6k awarded
Visited an election during any phase of an active election and had enough reputation to cast a vote
701 awarded
Left 10 comments
576 awarded
Earned at least 200 reputation (the daily maximum) in a single day
47 awarded
Followed the Area 51 proposal for this site before it entered the commitment phase
98 awarded
One post with score of 2 on meta
246 awarded
Posted 10 messages, with 1 or more starred, in chat
23 awarded

Tag Badges

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

Moderation Badges

First flagged post
993 awarded
First rollback
62 awarded
First down vote
841 awarded
Completed at least one review task. This badge is awarded once per review type
409 awarded
Deleted own post with score of 3 or higher
22 awarded
First edit
3.4k awarded
Edited first post that was inactive for 6 months
289 awarded
First retag
270 awarded
Deleted own post with score of -3 or lower
65 awarded
Approved or rejected 100 suggested edits
12 awarded
Used 30 votes in a day
99 awarded
First up vote
12k awarded
First approved tag synonym
9 awarded
First tag wiki edit
85 awarded
Used the maximum 40 votes in a day
49 awarded

Other Badges

Visited every section of the FAQ (retired)
308 awarded
Shared a link to a question that was visited by 25 unique IP addresses
198 awarded
Read the entire tour page
1k awarded