Here is the full list of all 100 Puzzle Art: Birds achievements.
Bird 50
Bird 100
Bird 99
Bird 49
Bird 48
Bird 98
Bird 47
Bird 97
Bird 46
Bird 96
Bird 95
Bird 45
Bird 44
Bird 94
Bird 93
Bird 43
Bird 42
Bird 92
Bird 41
Bird 91
Bird 40
Bird 90
Bird 89
Bird 39
Bird 88
Bird 38
Bird 37
Bird 87
Bird 36
Bird 86
Bird 35
Bird 85
Bird 34
Bird 84
Bird 33
Bird 83
Bird 32
Bird 82
Bird 81
Bird 31
Bird 30
Bird 80
Bird 79
Bird 29
Bird 28
Bird 78
Bird 27
Bird 77
Bird 76
Bird 26
Bird 25
Bird 75
Bird 74
Bird 24
Bird 73
Bird 23
Bird 22
Bird 72
Bird 21
Bird 71
Bird 70
Bird 20
Bird 19
Bird 69
Bird 18
Bird 68
Bird 17
Bird 67
Bird 16
Bird 66
Bird 15
Bird 65
Bird 14
Bird 64
Bird 13
Bird 63
Bird 12
Bird 62
Bird 11
Bird 61
Bird 10
Bird 60
Bird 9
Bird 59
Bird 58
Bird 8
Bird 7
Bird 57
Bird 6
Bird 56
Bird 5
Bird 55
Bird 54
Bird 4
Bird 53
Bird 3
Bird 52
Bird 2
Bird 51
Bird 1