I think there are a lot of redundant achievements from when they added "key"-achievements to the Progression category. "Veeshan's Peak Key" and "Scaled Key(group)" from RoS is another example.
The "key" achievements will now remove any key item from the game and track it in achievements, as well as on your key ring. (Not all key ring enabled keys are also achievements. E.G. Quintessence of Elements) Specifically, these are tied to in-game key items