user8033: I was looking at the achievements and I noticed that some might actually have a negative impact on the value of this SE website.

Vox Populi/Civic Duty (Use the maximum 40 votes in a day/ Vote 300 or more times)

May cause people to spam votes in order to get the achievement.

Cleanup (First rollback)

I'm not even sure on how to cause this, but I don't believe it's a good thing. Nor should we make people try to get a rollback (for the achievement) I believe.

Disciplined (Delete own post with score 3 or higher)

This is never a good thing?

Peer pressure (Delete own post with score -3 or lower)

This requires you to have a -3 post to begin with, so one could, purely for the achievement, attempt to get a -3 post?
It's all a bit theoretical but, the effect isn't easily spotted, so could be bigger than sensed.
(p.s. I found that all SE sites have these achievements, is this meta still the right spot to post this? Or should this be on general Stack Exchange meta?)

user2944: I was going to make a comment as it was going to be a bit long.
This is more of a general SE meta topic seems all sites have these achievements available. 
Also badges don't equate to privileges which are earned by making meaningful contribution to each SE site.
So if there are people who want to go around sites asking stupid questions or spamming unimportant questions or answers just to earn a badge they will probably be the ones who have a low rep keeping them away from established user privileges.
There is also a good side to the achievements as it gives the incentive to other users to participate in the site and feel like they have been commended for that involvement. For example

Vox Populi/Civic Duty (Use the maximum 40 votes in a day/ Vote 300 or more times)

This to me would make people want to show others that there are useful questions or answers on the site and cause that user to participate in site activities.
The one for giving someone a badge for a question with -3 votes I would think would be aimed at new users and others here and there so as to keep the site uncluttered from nonsense questions, thus another incentive to users or newbies to help keep the sites running smoothly.

8033: <p>I was looking at the achievements and I noticed that some might actually have a negative impact on the value of this SE website.</p>

<ul>
<li>Vox Populi/Civic Duty (Use the maximum 40 votes in a day/ Vote 300 or more times)</li>
</ul>

<p>May cause people to spam votes in order to get the achievement.</p>

<ul>
<li>Cleanup (First rollback)</li>
</ul>

<p>I'm not even sure on how to cause this, but I don't believe it's a good thing. Nor should we make people try to get a rollback (for the achievement) I believe.</p>

<ul>
<li>Disciplined (Delete own post with score 3 or higher)</li>
</ul>

<p>This is never a good thing?</p>

<ul>
<li>Peer pressure (Delete own post with score -3 or lower)</li>
</ul>

<p>This requires you to have a -3 post to begin with, so one could, purely for the achievement, attempt to get a -3 post?</p>

<p>It's all a bit theoretical but, the effect isn't easily spotted, so could be bigger than sensed.</p>

<p>(p.s. I found that all SE sites have these achievements, is this meta still the right spot to post this? Or should this be on general Stack Exchange meta?)</p>
 2944: <p>I was going to make a comment as it was going to be a bit long.</p>

<p>This is more of a general SE meta topic seems all sites have these achievements available. </p>

<p>Also badges don't equate to privileges which are earned by making meaningful contribution to each SE site.</p>

<p>So if there are people who want to go around sites asking stupid questions or spamming unimportant questions or answers just to earn a badge they will probably be the ones who have a low rep keeping them away from established user privileges.</p>

<p>There is also a good side to the achievements as it gives the incentive to other users to participate in the site and feel like they have been commended for that involvement. For example</p>

<blockquote>
  <p>Vox Populi/Civic Duty (Use the maximum 40 votes in a day/ Vote 300 or more times)</p>
</blockquote>

<p>This <em>to me</em> would make people want to show others that there are useful questions or answers on the site and cause that user to participate in site activities.</p>

<p>The one for giving someone a badge for a question with <code>-3</code> votes I would think would be aimed at new users and others here and there so as to keep the site uncluttered from nonsense questions, thus another incentive to users or newbies to help keep the sites running smoothly.</p>
