No (Destiny)

by petetheduck, Saturday, September 27, 2014, 06:46 (3951 days ago) @ Blackt1g3r

You get an upgraded Sparrow for finding all the gold chests in Old Russia (it will be in the last chest you open). One of them seems to always give a rocket launcher as well (the one in the Dark Within). I never got anything memorable from any other ones, but I did get weapons/armor, so I suspect those were the prizes.

There doesn't seem to be one really big prize for finding all of them on all the planets, though.