Hi,
If you have been using Asana long enough, things used to be easy: a feature was related to a plan. Workload was a Business feature. Custom fields were a Premium feature. etc
But things started to get blurry and we recently realised a lot of features where actually overlapping plans/tiers, with subtle differences.
At iDO we worked on a full list just to do our job better as consultants. We thought it could be useful to the community as a whole.
To make things interesting, we used a read-only Timeline view as a way to share our findings. Just click on the image 
PS: this is meant to be a collaborative list, so let us know if there are mistakes or missing pieces