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 award on another person's question
4 awarded
First bounty you manually award on your own question
2 awarded
Ask a well-received question on 5 separate days, and maintain a positive question record
45 awarded
First bounty you offer on another person's question
7 awarded
Question score of 10 or more
359 awarded
Question with 1,000 views
370 awarded
First bounty you offer on your own question
8 awarded
Ask a question and accept an answer
192 awarded
First question with score of 1 or more
266 awarded

Answer Badges

Edit and answer 1 question (both actions within 12 hours, answer score > 0)
17 awarded
Answer score of 10 or more
261 awarded
Answer more than 30 days after a question was asked as first answer scoring 2 or more
109 awarded
Answer your own question with score of 3 or more
21 awarded
Answer a question with score of 1 or more
232 awarded

Participation Badges

Complete "About Me" section of user profile
805 awarded
Visit an election during any phase of an active election and have enough reputation to cast a vote
Leave 10 comments
71 awarded
Earn at least 200 reputation (the daily maximum) in a single day
28 awarded
Followed the Area 51 proposal for this site before it entered the commitment phase
77 awarded
One post with score of 2 on meta
37 awarded
Post 10 messages, with 1 or more starred, in chat
15 awarded

Tag Badges

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

Moderation Badges

First flagged post
38 awarded
First rollback
8 awarded
First down vote
116 awarded
Complete at least one review task. This badge is awarded once per review type
122 awarded
Delete own post with score of 3 or higher
5 awarded
First edit
230 awarded
Edit first post that was inactive for 6 months
15 awarded
First retag
27 awarded
Delete own post with score of -3 or lower
8 awarded
Approve or reject 100 suggested edits
1 awarded
Use 30 votes in a day
24 awarded
First up vote
599 awarded
First approved tag synonym
4 awarded
First tag wiki edit
11 awarded
Use the maximum 40 votes in a day
19 awarded

Other Badges

Share a link to a post later visited by 25 unique IP addresses
21 awarded
Read the entire tour page
314 awarded

Retired Badges

Visited every section of the FAQ
Asked a question with zero score, no answers, no comments, and low views for a week
10 awarded