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
30 awarded
First bounty you manually awarded on your own question
229 awarded
Asked a well-received question on 5 separate days, and maintained a positive question record
453 awarded
First bounty you offered on another person's question
51 awarded
Question score of 10 or more
419 awarded
Asked a question with 1,000 views
6.7k awarded
First bounty you offered on your own question
402 awarded
Asked a question and accepted an answer
7.9k awarded
Asked first question with score of 1 or more
8.3k awarded
Asked a question with no votes, no answers, no comments, and low views for a week
3.9k awarded

Answer Badges

Answer score of 10 or more
673 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
254 awarded
Answered first question with score of 1 or more
5.3k awarded

Participation Badges

Completed all user profile fields
7.2k awarded
Visited an election during any phase of an active election and had enough reputation to cast a vote
558 awarded
Left 10 comments
2.5k awarded
Earned at least 200 reputation (the daily maximum) in a single day
35 awarded
Followed the Area 51 proposal for this site before it entered the commitment phase
70 awarded
One post with score of 2 on meta
185 awarded
Posted 10 messages, with 1 or more starred, in chat
65 awarded

Tag Badges

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

Moderation Badges

First flagged post
735 awarded
First rollback
91 awarded
First down vote
720 awarded
Completed at least one review task. This badge is awarded once per review type
774 awarded
Deleted own post with score of 3 or higher
10 awarded
First edit
8.2k awarded
Edited first post that was inactive for 6 months
324 awarded
First retag
283 awarded
Deleted own post with score of -3 or lower
101 awarded
Approved or rejected 100 suggested edits
15 awarded
Used 30 votes in a day
96 awarded
First up vote
7.2k awarded
First approved tag synonym
11 awarded
First tag wiki edit
70 awarded
Used the maximum 40 votes in a day
59 awarded

Other Badges

Visited every section of the FAQ (retired)
411 awarded
Shared a link to a question that was visited by 25 unique IP addresses
321 awarded
Read the entire about page
999 awarded