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
22 awarded
First bounty you manually awarded on your own question
50 awarded
Asked a well-received question on 5 separate days, and maintained a positive question record
191 awarded
Asked a well-received question on 30 separate days, and maintained a positive question record
10 awarded
Asked a well-received question on 100 separate days, and maintained a positive question record
1 awarded
Question favorited by 25 users
1 awarded
Question favorited by 100 users
First bounty you offered on another person's question
33 awarded
Question score of 10 or more
551 awarded
Question score of 25 or more
46 awarded
Question score of 100 or more
1 awarded
Asked a question with 1,000 views
750 awarded
Asked a question with 2,500 views
327 awarded
Asked a question with 10,000 views
67 awarded
First bounty you offered on your own question
87 awarded
Asked a question and accepted an answer
1.6k awarded
Asked first question with score of 1 or more
2.9k awarded
Asked a question with no votes, no answers, no comments, and low views for a week
137 awarded

Answer Badges

First to answer and accepted with score of 10 or more
321 awarded
Edited and answered 1 question (both actions within 12 hours, answer score > 0)
79 awarded
Edited and answered 50 questions (both actions within 12 hours, answer score > 0)
2 awarded
Edited and answered 500 questions (both actions within 12 hours, answer score > 0)
Provided non-wiki answers of 15 total score in 20 of top 40 tags
Accepted answer and score of 40 or more
10 awarded
Answer score of 10 or more
659 awarded
Answer score of 25 or more
65 awarded
Answer score of 100 or more
1 awarded
Highest scoring answer that outscored an accepted answer with score of more than 10 by more than 2x
Provided answer of +20 score to a question of -5 score
Answered more than 30 days later as first answer scoring 2 or more
430 awarded
Answered a question more than 60 days later with score of 5 or more
112 awarded
Answered your own question with score of 3 or more
58 awarded
Answered first question with score of 1 or more
1.3k awarded
Zero score accepted answers: more than 5 and 20% of total
Zero score accepted answers: more than 10 and 25% of total

Participation Badges

Completed "About Me" section of user profile
3.3k awarded
Visited an election during any phase of an active election and had enough reputation to cast a vote
Voted for a candidate in the final phase of an election
Left 10 comments
379 awarded
Left 10 comments with score of 5 or more
7 awarded
Visited the site each day for 30 consecutive days. (Days are counted in UTC.)
106 awarded
Visited the site each day for 100 consecutive days. (Days are counted in UTC.)
30 awarded
Earned at least 200 reputation (the daily maximum) in a single day
28 awarded
Earned 200 daily reputation 50 times
Earned 200 daily reputation 150 times
Followed the Area 51 proposal for this site before it entered the commitment phase
55 awarded
Voted 10 times, added 3 posts score > 0, and visited the site on 3 separate days during the private beta
25 awarded
One post with score of 2 on meta
141 awarded
10 posts with score of 2 on meta
16 awarded
Posted 10 messages, with 1 or more starred, in chat
25 awarded
Posted 10 messages in chat that were starred by 10 different users
Active member for a year, earning at least 200 reputation
605 awarded

Tag Badges

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

Moderation Badges

First flagged post
278 awarded
Raised 80 helpful flags
5 awarded
Raised 500 helpful flags
1 awarded
Voted 300 or more times
51 awarded
First rollback
42 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
First down vote
336 awarded
Completed at least one review task. This badge is awarded once per review type
575 awarded
Completed at least 250 review tasks. This badge is awarded once per review type
11 awarded
Completed at least 1,000 review tasks. This badge is awarded once per review type
1 awarded
Deleted own post with score of 3 or higher
14 awarded
First edit
1.6k awarded
Edited 80 posts
16 awarded
Edited 500 posts (excluding own or deleted posts and tag edits)
1 awarded
Voted on 600 questions and 25% or more of total votes are on questions
11 awarded
Edited first post that was inactive for 6 months
83 awarded
Edited 100 posts that were inactive for 6 months
First retag
156 awarded
Deleted own post with score of -3 or lower
33 awarded
Approved or rejected 100 suggested edits
8 awarded
Up voted 100 answers on questions where an answer of yours has a positive score
Used 30 votes in a day
47 awarded
First up vote
2.8k awarded
First approved tag synonym
3 awarded
First tag wiki edit
52 awarded
Edited 50 tag wikis
1 awarded
Created a tag used by 50 questions
37 awarded
Used the maximum 40 votes in a day
36 awarded

Other Badges

Visited every section of the FAQ (retired)
70 awarded
Shared a link to a question that was visited by 25 unique IP addresses
31 awarded
Shared a link to a question that was visited by 300 unique IP addresses
2 awarded
Shared a link to a question that was visited by 1000 unique IP addresses
Read the entire tour page
422 awarded
http://biology.stackexchange.com/help/badges?tab=general&filter=all
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