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

Had typed a long response and it went away, let's try again... 😅

So, been lately in a Castlevania binge (Metroidvanias only, I've always sucked at the platforming ones) and there's a nice group of games there, you beat Aria, now try Dawn which happens a year later, a very rare direct sequel among these. Then there's Harmony of Dissonance, Circle of the Moon if you're into that one (I'm lukewarm on this one), Dawn as mentioned, Portrait of Ruin and Order of Ecclessia, and of course the grandaddy of them all, Symphony of the Night. All these are FREAKING FULL of achievements on Retroachievements, unlike the officially released versions on Steam with the Advance and Dominus collections, which only have a tiny handful for each game. Retroachievements has like 5 to 10 times the achievements for games, every achievement on the official releases is in Retroachievements, along with A LOT of ones not covered. Even tiny little missable details like this one on Symphony which I've always loved. It also has achievements for the nutcases like speedrunning ones or the "Defeat X with no damage and without using so and so item".

Just make sure the emulator and retroachievements recognize it, i'll have to redo Portrait at some point because it never recognized it as Portrait for some reason (ROM issues or something?)

And of course, once you're done with these, there's Bloodstained, the Castlevaina not Castlevania, quite fun and with the right vibe!