I have successfully proved coordinates in 29 different graticules. (Plus two with insufficient proof). I need 100 for the Graticule Hopper achievement.
Here are all the graticules I have geohashed in, north to south and west to east. Green have had a successful expedition with proof, amber are successful but with insufficient proof, and red means only unsuccessful expeditions so far. Horizontal lines are just to facilitate counting.
55 -120 - Dawson Creek, BC
55 -119 - Beaverlodge, AB
55 -115 - Utikuma Lake, AB
55 -114 - Slave Lake, AB
54 -119 - Nose Creek, AB
54 -114 - Barrhead, AB
53 -113 - Edmonton, AB
50 -120 - Kamloops, BC
50 -119 - Vernon, BC
49 -124 - Port Alberni, BC
49 -123 - Vancouver, BC
49 -122 - Surrey, BC
49 -121 - Chilliwack, BC
49 -120 - Princeton, BC
49 -119 - Kelowna, BC
48 -123 - Victoria, BC
48 -122 - Bellingham, WA
48 -121 - North Cascades, WA
47 -122 - Seattle, WA
47 -121 - Snoqualmie, WA
47 -73 - Montréal, QC
44 -123 - Eugene, OR
42 -123 - Grants Pass, OR
41 -111 - Ogden, UT
40 -112 - Tooele, UT
40 -75 - Allentown, PA
39 -121 - Chico, CA
32 -96 - Dallas, TX
32 -95 - Tyler, TX
32 -94 - Longview, TX