Explore Westfall

Based on the map above: Sentinel Hill (54, 50) Saldean's Farm (54, 32) Furlbrow's Pumpkin Farm (51, 22) The Jansen Stead (58, 17) Jangolode Mine (44, 25) The Molsen Farm (44, 35) Gold Coast Quarry (32, 43) The Dead Acre (62, 60) Moonbrook (43, 69) Alexston Farmstead (38, 52) Demont's Place (32, 65) Westfall Lighthouse (30, 86) The Dagger Hills (47, 78) The Dust Plains (64, 72)

Here is a map of where you explore everything for this achievement's criteria.

I don't know about anyone else, but the replies people post to give TomTom coords never come out in a way that I can copy and paste, so here is one of the posts for TomTom copied and pasted again for you:

/way 56.56 19.28 The Jansen Stead
/way 49.57 19.40 Furlbrow's Pumpkin Farm
/way 44.58 25.38 Jangolode Mine
/way 45.91 38.62 The Molsen Farm
/way 56.09 31.19 Saldean's Farm
/way 56.85 47.31 Sentinel Hill
/way 60.91 58.69 The Dead Acre

/way 38.49 42.59 The Raging Chasm
/way 36.65 54.23 Alexston Farmstead
/way 43.70 69.47 Moonbrook
/way 34.01 74.31 Demont's Place
/way 30.22 85.64 Westfall Lighthouse
/way 39.91 80.56 The Dagger Hills
/way 65.55 70.95 The Dust Plains