I looked up this post as I came across someone else with an Arborist badge and wondered just what it meant. Guess I've been doing this for a couple of years now, so I went back in the records and checked just how many I've worked on.
Since June 2017 I've proposed 122 merges, merged & tidied post merge 61, and tidied a further 66 where the basic merge had been done but the resulting profile had not been cleaned up.
Does this meet your criteria?
I'll keep plugging away at it anyway, but it would be nice to have the badge to go with it and better still to have it added to my G2G notifications list.