Would construct be able to implent this? gamejolt.com/developers/achievements/[url=http://gamejolt.com/developers/achievements/]http://gamejolt.com/developers/achievements/[/url]
There's actually a plugin for construct made by the creator of the site. Check their forums, I think it's there.
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There is Newt's CodeStruct but I don't know if it contains code for the achievement.