You can see them on your Armory, in the Feat of Strength, Promotion section here
I’m only seeing 2017 there though, Rides of War, the Skychaser and Interceptor mounts.
2016 would have been the Murloc Battlemasters.
2018 was Flying Colors the mantles and banners.
We do usually have achievement for those goodies, but like Jadzía and Dawnmoor mentioned those have been added in at later dates before.
Here’s a link to a list of those Feats