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
56 awarded
First bounty you manually awarded on your own question
232 awarded
Asked a well-received question on 5 separate days, and maintained a positive question record
860 awarded
Asked a well-received question on 30 separate days, and maintained a positive question record
62 awarded
Asked a well-received question on 100 separate days, and maintained a positive question record
1 awarded
Question favorited by 25 users
52 awarded
Question favorited by 100 users
4 awarded
First bounty you offered on another person's question
102 awarded
Question score of 10 or more
2.1k awarded
Question score of 25 or more
295 awarded
Question score of 100 or more
12 awarded
Asked a question with 1,000 views
4.1k awarded
Asked a question with 2,500 views
1.4k awarded
Asked a question with 10,000 views
171 awarded
First bounty you offered on your own question
402 awarded
Asked a question and accepted an answer
6.4k awarded
Asked first question with score of 1 or more
10.9k awarded
Asked a question with no votes, no answers, no comments, and low views for a week
730 awarded

Answer Badges

First to answer and accepted with score of 10 or more
851 awarded
Provided non-wiki answers of 15 total score in 20 of top 40 tags
25 awarded
Accepted answer and score of 40 or more
76 awarded
Answer score of 10 or more
2.7k awarded
Answer score of 25 or more
366 awarded
Answer score of 100 or more
14 awarded
Highest scoring answer that outscored an accepted answer with score of more than 10 by more than 2x
16 awarded
Provided answer of +20 score to a question of -5 score
Answered more than 30 days later as first answer scoring 2 or more
760 awarded
Answered a question more than 60 days later with score of 5 or more
335 awarded
Answered your own question with score of 3 or more
114 awarded
Answered first question with score of 1 or more
5k awarded
Zero score accepted answers: more than 5 and 20% of total
11 awarded
Zero score accepted answers: more than 10 and 25% of total
4 awarded

Participation Badges

Completed all user profile fields
5.3k awarded
Visited an election during any phase of an active election and had enough reputation to cast a vote
445 awarded
Voted for a candidate in the final phase of an election
260 awarded
Left 10 comments
2.2k awarded
Left 10 comments with score of 5 or more
44 awarded
Visited the site each day for 30 consecutive days. (Days are counted in UTC.)
583 awarded
Visited the site each day for 100 consecutive days. (Days are counted in UTC.)
163 awarded
Earned at least 200 reputation (the daily maximum) in a single day
161 awarded
Earned 200 daily reputation 50 times
2 awarded
Earned 200 daily reputation 150 times
Followed the Area 51 proposal for this site before it entered the commitment phase
55 awarded
Actively participated in the private beta
42 awarded
One post with score of 2 on meta
450 awarded
10 posts with score of 2 on meta
41 awarded
Posted 10 messages, with 1 or more starred, in chat
134 awarded
Posted 10 messages in chat that were starred by 10 different users
20 awarded
Active member for a year, earning at least 200 reputation
2.3k awarded

Tag Badges

You must have a total score of 100 in at least 20 non-community wiki answers to achieve this badge.
301 awarded
You must have a total score of 400 in at least 80 non-community wiki answers to achieve this badge.
30 awarded
You must have a total score of 1000 in at least 200 non-community wiki answers to achieve this badge.
3 awarded

Moderation Badges

First flagged post
1k awarded
Raised 80 helpful flags
35 awarded
Raised 500 helpful flags
5 awarded
Voted 300 or more times
186 awarded
First rollback
133 awarded
Served as a pro-tem moderator for at least 1 year or through site graduation
4 awarded
Served as an elected moderator for at least 1 year
5 awarded
First down vote
1.4k awarded
Completed at least one review task. This badge is awarded once per review type
1.7k awarded
Completed at least 250 review tasks. This badge is awarded once per review type
67 awarded
Completed at least 1,000 review tasks. This badge is awarded once per review type
11 awarded
Deleted own post with score of 3 or higher
69 awarded
First edit
7k awarded
Edited 80 posts
34 awarded
Edited 500 posts
7 awarded
Voted on 600 questions and 25% or more of total votes are on questions
44 awarded
Edited first post that was inactive for 6 months
307 awarded
Edited 100 posts that were inactive for 6 months
2 awarded
First retag
486 awarded
Deleted own post with score of -3 or lower
196 awarded
Approved or rejected 100 suggested edits
30 awarded
Up voted 100 answers on questions where an answer of yours has a positive score
10 awarded
Used 30 votes in a day
180 awarded
First up vote
10.3k awarded
First approved tag synonym
10 awarded
First tag wiki edit
96 awarded
Edited 50 tag wikis
1 awarded
Created a tag used by 50 questions
109 awarded
Used the maximum 40 votes in a day
101 awarded

Other Badges

Visited every section of the FAQ (retired)
271 awarded
Shared a link to a question that was visited by 25 unique IP addresses
142 awarded
Shared a link to a question that was visited by 300 unique IP addresses
9 awarded
Shared a link to a question that was visited by 1000 unique IP addresses
7 awarded
Read the entire about page
1.5k awarded
http://physics.stackexchange.com/help/badges?tab=general&filter=unearned
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