What the achievement asks
Complete 100 tasks for Soridormi while running Time Rifts. Account-wide.
Where and when
Rifts open at the Temporal Conflux in Thaldraszus, where Soridormi stands at 51.5 57.1. They begin at the top of the hour and run about twenty minutes.
What counts as a task
Soridormi hands out small jobs during the rift: kill this, collect that, escort the other. Each one you finish and report back adds one to the hundred.
It does not matter which task you take or which reality the hour has brought. Every completed task counts the same, so never wait for a "better" one. Take whatever is offered, finish it, take the next.
A busy rift where you keep moving is worth roughly a dozen tasks. That puts the achievement at somewhere around eight to ten full rifts, which is the largest time cost in this branch after Collapsed Reality.
The one thing that wastes rifts
Standing at the Conflux waiting for something to happen is the mistake. The task list refreshes constantly and the twenty minutes go quickly, so the difference between a good rift and a poor one is entirely whether you were turning tasks in or reading your map.
This is the achievement that decides how many hours the branch takes, so it should be running in the background of every rift you enter for another reason. Anyone chasing Collapsed Reality, which needs a crowded rift and several attempts, will pass 100 tasks along the way without ever aiming at it.
Where it fits
One of ten under Closing Time, a piece of A World Awoken.