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
First bounty you manually awarded on your own question
Question favorited by 25 users
1 awarded
Question favorited by 100 users
First bounty you offered on another person's question
Question score of 10 or more
57 awarded
Question score of 25 or more
6 awarded
Question score of 100 or more
Asked a question with 1,000 views
4 awarded
Asked a question with 2,500 views
1 awarded
Asked a question with 10,000 views
First bounty you offered on your own question
Asked a question and accepted an answer
141 awarded
Asked first question with score of 1 or more
223 awarded
Asked a question with no votes, no answers, no comments, and low views for a week
6 awarded

Answer Badges

First to answer and accepted with score of 10 or more
19 awarded
Provided non-wiki answers of 15 total score in 20 of top 40 tags
Accepted answer and score of 40 or more
Answer score of 10 or more
72 awarded
Answer score of 25 or more
8 awarded
Answer score of 100 or more
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
18 awarded
Answered a question more than 60 days later with score of 5 or more
18 awarded
Answered your own question with score of 3 or more
16 awarded
Answered first question with score of 1 or more
151 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 all user profile fields
1.4k awarded
Left 10 comments
54 awarded
Left 10 comments with score of 5 or more
Visited the site each day for 30 consecutive days
12 awarded
Visited the site each day for 100 consecutive days
2 awarded
Earned at least 200 reputation (the daily maximum) in a single day
1 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
Actively participated in the private beta
Posted 10 messages, with 1 or more starred, in chat
Posted 10 messages in chat that were starred by 10 different users
Active member for a year, earning at least 200 reputation
1.6k awarded

Tag Badges

You must have a total score of 100 in at least 20 non-community wiki answers to achieve this badge.
6 awarded
You must have a total score of 400 in at least 80 non-community wiki answers to achieve this badge.
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
27 awarded
Raised 80 helpful flags
Raised 500 helpful flags
Voted 300 or more times
2 awarded
First rollback
9 awarded
Served as a pro-tem moderator for at least 1 year or through site graduation
Served as an elected moderator for at least 1 year
First down vote
114 awarded
Completed at least one review task. This badge is awarded once per review type
7 awarded
Completed at least 250 review tasks. This badge is awarded once per review type
Completed at least 1,000 review tasks. This badge is awarded once per review type
Deleted own post with score of 3 or higher
5 awarded
First edit
122 awarded
Edited 80 posts
Edited 500 posts
Voted on 600 questions and 25% or more of total votes are on questions
Edited first post that was inactive for 6 months
8 awarded
Edited 100 posts that were inactive for 6 months
First retag
42 awarded
Deleted own post with score of -3 or lower
2 awarded
Approved or rejected 100 suggested edits
Up voted 100 answers on questions where an answer of yours has a positive score
Used 30 votes in a day
2 awarded
First up vote
710 awarded
First approved tag synonym
2 awarded
First tag wiki edit
6 awarded
Edited 50 tag wikis
Created a tag used by 50 questions
2 awarded
Used the maximum 40 votes in a day
2 awarded

Other Badges

Visited every section of the FAQ (retired)
56 awarded
Shared a link to a question that was visited by 25 unique IP addresses
6 awarded
Shared a link to a question that was visited by 300 unique IP addresses
Shared a link to a question that was visited by 1000 unique IP addresses
http://meta.apple.stackexchange.com/help/badges
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