Im not too sure about that. The fishing quests would make the run take hours alone, as well as some RNG annoyances, 'Robbing the Grave' 'Jeepers Creepers' 'Archaeologist' and 'Deceiver of Fools', (dungeon loot, spider biome, nymph, doctor bones) also an AB&E run takes forever normally but if you have to do a lot of other things like getting the Terra Blade, Rainbow Rod, 9 Minions at once, and more. This category is a little unrealistic. A lot of these achievements are meant to give the game replayability and even doing all of them in a single sitting would be exhausting.

I use VSDC free video editor, it allows me to start a timer on the frame i want and end it on the frame i want as well. It goes up to 10 hrs of counting. To add the timer, go to editor > add object > text > counter. It is slow to export with the free version but that is the only downside for me.