Here is the full list of all 94 Mega Mosaic achievements.
Complete Region 1
Complete 1%
Complete 2%
Complete 3%
Complete 4%
Complete 5%
Complete 6%
Complete 7%
Complete 8%
Complete 9%
Complete 10%
Complete 11%
Complete 12%
Complete 13%
Complete 14%
Complete 17%
Complete 20%
Complete 22%
Complete 25%
Complete 27%
Complete 30%
Complete 32%
Complete 35%
Complete 37%
Complete 40%
Complete 42%
Complete 45%
Complete 48%
Complete 50%
Complete 52%
Complete 55%
Complete 58%
Complete 62%
Complete 67%
Complete 69%
Complete 72%
Complete 78%
Complete 83%
Complete 88%
Complete 96%
Complete 100%
Complete Region 2
Complete Region 3
Complete Region 4
Complete Region 5
Complete Region 6
Complete Region 7
Complete Region 8
Complete Region 9
Complete Region 10
Complete Region 11
Complete Region 12
Complete Region 13
Complete Region 14
Complete Region 15
Complete Region 16
Complete Region 17
Complete Region 18
Complete Region 19
Complete Region 20
Complete Region 21
Complete Region 22
Complete Region 23
Complete Region 24
Complete Region 25
Complete Region 26
Complete Region 27
Complete Region 28
Complete Region 29
Complete Region 30
Complete Region 31
Complete Region 32
Complete Region 33
Complete Region 34
Complete Region 35
Complete Region 36
Complete Region 37
Complete Region 38
Complete Region 39
Complete Region 40
Complete Region 41
Complete Region 42
Complete Region 43
Complete Region 44
Complete Region 45
Complete Region 46
Complete Region 47
Complete Region 48
Complete Region 49
Complete Region 50
Complete the entire northern border
Complete the entire southern border
Complete the entire western border
Complete the entire eastern border