The only other categories that would be feasible would be ones that involve getting the other four endings (I'm leaving out the other true ending). I could maybe see doing the main quest line, but you are still going to see luck being factor getting through some of the areas besides the Sarcophagus in an efficient manner (Bandit Base and Wild Territory come to mind).

Just do Call of Pripyat - 100%. Its about all quests, all caches, main heroes must be alive ( Zulus, Sokolov, and ect. ) + the best endings + all achievements.

get good