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
5 awarded
First bounty you manually award on your own question
14 awarded
Ask a good question on 5 separate days, and maintain a positive question record
77 awarded
First bounty you offer on another person's question
7 awarded
Question score of 10 or more
683 awarded
Question with 1,000 views
541 awarded
First bounty you offer on your own question
17 awarded
Ask a question and accept an answer
400 awarded
First question with score of 1 or more
637 awarded
Asked a question with zero score, no answers, no comments, and low views for a week
4 awarded

Answer Badges

Edit and answer 1 question (both actions within 12 hours, answer score > 0)
35 awarded
Answer score of 10 or more
792 awarded
Answer more than 30 days after a question was asked as first answer scoring 2 or more
57 awarded
Answer your own question with score of 3 or more
51 awarded
Answer a question with score of 1 or more
1k awarded

Participation Badges

Complete "About Me" section of user profile
2.3k awarded
Visit an election during any phase of an active election and have enough reputation to cast a vote
Leave 10 comments
184 awarded
Earn at least 200 reputation (the daily maximum) in a single day
27 awarded
Followed the Area 51 proposal for this site before it entered the commitment phase
56 awarded
One post with score of 2 on meta
104 awarded
Post 10 messages, with 1 or more starred, in chat
28 awarded

Tag Badges

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

Moderation Badges

First flagged post
162 awarded
First rollback
9 awarded
First down vote
174 awarded
Complete at least one review task. This badge is awarded once per review type
336 awarded
Delete own post with score of 3 or higher
8 awarded
First edit
550 awarded
Edit first post that was inactive for 6 months
54 awarded
First retag
83 awarded
Delete own post with score of -3 or lower
3 awarded
Approve or reject 100 suggested edits
5 awarded
Use 30 votes in a day
49 awarded
First up vote
1.5k awarded
First approved tag synonym
6 awarded
First tag wiki edit
44 awarded
Use the maximum 40 votes in a day
32 awarded

Other Badges

Visited every section of the FAQ (retired)
50 awarded
Share a link to a question later visited by 25 unique IP addresses
13 awarded
Read the entire tour page
217 awarded