Started D4 with season 3. Completed 76 from all 76 locations in Fractured Peaks, but I did not get Fractured Peaks Wanderer achievement. Right now, I moved to off-season world with 75 from 75 locations in Fractured Peaks. Still achievement has not completed… so frustrating…
I have the same problem, no the Place to Discover are 74, i Ve drone all 74 but no achievement unlocked, i Hope the fix this problem 
I have the exact same problem on PS5