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
17 awarded
First bounty you manually awarded on your own question
39 awarded
Asked a well-received question on 5 separate days, and maintained a positive question record
292 awarded
First bounty you offered on another person's question
26 awarded
Question score of 10 or more
1.4k awarded
Asked a question with 1,000 views
5.2k awarded
First bounty you offered on your own question
51 awarded
Asked a question and accepted an answer
2.6k awarded
Asked first question with score of 1 or more
4.5k awarded
Asked a question with no votes, no answers, no comments, and low views for a week
35 awarded

Answer Badges

Edited and answered 1 question (both actions within 12 hours, answer score > 0)
74 awarded
Answer score of 10 or more
2.1k awarded
Answered more than 30 days later as first answer scoring 2 or more
174 awarded
Answered your own question with score of 3 or more
99 awarded
Answered first question with score of 1 or more
4.4k awarded

Participation Badges

Completed "About Me" section of user profile
7.8k awarded
Visited an election during any phase of an active election and had enough reputation to cast a vote
448 awarded
Left 10 comments
636 awarded
Earned at least 200 reputation (the daily maximum) in a single day
72 awarded
Followed the Area 51 proposal for this site before it entered the commitment phase
67 awarded
One post with score of 2 on meta
183 awarded
Posted 10 messages, with 1 or more starred, in chat
55 awarded

Tag Badges

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

Moderation Badges

First flagged post
560 awarded
First rollback
63 awarded
First down vote
701 awarded
Completed at least one review task. This badge is awarded once per review type
424 awarded
Deleted own post with score of 3 or higher
18 awarded
First edit
2k awarded
Edited first post that was inactive for 6 months
177 awarded
First retag
247 awarded
Deleted own post with score of -3 or lower
33 awarded
Approved or rejected 100 suggested edits
12 awarded
Used 30 votes in a day
124 awarded
First up vote
6.1k awarded
First approved tag synonym
11 awarded
First tag wiki edit
54 awarded
Used the maximum 40 votes in a day
53 awarded

Other Badges

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