There are a bunch of contracts for playing with trinkets that you unlock in premium Journey. A huge bunch.
With the current Journey and the Premium version which gives you the first 25 levels for the price, do you only get the first 25 levels or can you play the Premium version of the entire Journey, even the levels past Level 100?
To fully claim all the rewards this journey offers check your contracts page---> switch to "all" and type in the search bar "Alzur", this will show you what you need to do to get all the cosmetics.
This filter doesn't cover all the Journey contracts. Eg. You'd end up missing the mutagen contracts. Only way to view all of Alzur Journey's contracts is to scroll all the way down in the General tab unfortunately.
A "Journey" tab in Contracts would be a huge QOL improvement, and has been suggested multiple times on Reddit.