Before writing this down manually, I wanted to know whether it is possible to get a list (with dates) of all journeys I did/completed?
No, unfortunately this has to be written manually 
This ties into multiple other thread about being able to monitor progress on the app. The app should know what my stats are every time i take a new journey, Are there any plans to improve this rather than users tracking it manually or using other apps? Its a deal breaker i think.
For me it’s not really a deal breaker but it sounds so easy to just be able to see what journey I did at what time and how I idk performed in it…
Yeah, unfortunately it’s not something that we show in the app 
I’ll bring it up for discussion again 
check the app Hevy, its so simple to do.