You get this achievement for tidying up three times. The three opportunities to do tidy up are:
1. You can set the clock hands to midnight in Betty's room while in Bexhill.
2. You can straighten out the suitcase Hastings is packing after Brexhill.
3. You can straighten out the planter outside of the mansion on your second visit to Churston.
If you do two of the three you'll unlock this achievement, as well as
The Snowflake achievement in Agatha Christie: The ABC Murders worth 13 pointsYou believe that symmetry is the source of all beauty and that order generates virtue. What a pleasure it is to sort through things and tidy up!