I keep notes. It's hard on the beginning, as there will be plenty of stuff to your down. Just use your codex and inventory to figure out what you are missing. And then scratch stuff when you get them. Also add new content when they get released. It's easier on the long run.
What disapoint me is that when i get those ¿Cracked mods? (It is a literal translation, those purple) they always ask me for Seven levels more than i am. Why so miuc hate?