Use the game’s own progress indicators
Start with the counters and objectives shown by your installed version. The official feature list describes more than 1,000 items across 10 stalls, but it is not a complete achievement or 100-percent checklist. Do not assume every secret, companion or leaderboard position is required for a particular completion counter.
Work through the market systematically
Choose a stall or section, inspect nearby objects and return items to their matching shelves. The official quality-of-life description says appropriate items are automatically selected when shelving; actively holding a particular item is unnecessary. Explore from several viewpoints before deciding an item has disappeared.
Separate sorting from optional goals
The game includes spells, animal companions, secrets and optional leaderboards. Track the objective you are actually trying to finish rather than combining all these systems into one assumed requirement. There is no time limit or game-over state. Read the marketplace guide and 99-percent checklist for a structured next step.