What's retroachievements? Basically it adds XBOX Live style achievements and global high score tables to retro emulation platforms. This added layer of social gaming and community driven accomplishment hunting really builds on the retro games emulation experience. The best part is you can get it running on pretty much any platform you emulate games on, your phone, your deck, your weird android handheld, HTPC, even your lappy-5000.
Since RA adds score and achievement tracking, those of us who game at decisively higher levels and compete for the most glorious prizes imaginable like to use it to track our games. Now is a great time to get it set up, so when the call for challengers comes to Beehaw, you can dive right in.
Here are some of the most fun achievements I have personally gotten.
Batman Returns
Castlevania 3
Arthur's Absolutely Fun Day
Felix the Cat
Anyway, this has been anarchist propaganda, toodles
Usually I don't make these sort of replies, but did you even try and figure it out for yourself? You literally go to the website and type Contra into the search box...
https://retroachievements.org/searchresults.php?s=contra
Ahh crap, I kept searching for Contra in docs.retroachievements.org instead of the original site and found nothing. Thanks.