Here is the full list of all 100 Perfectly Balanced achievements.
End Level - 1
End Level - 2
End Level - 4
End Level - 5
End Level - 6
End Level - 8
End Level - 9
End Level - 10
End Level - 11
End Level - 12
End Level - 13
End Level - 14
End Level - 16
End Level - 17
End Level - 18
End Level - 19
End Level - 20
End Level - 21
End Level - 22
End Level - 23
End Level - 24
End Level - 26
End Level - 27
End Level - 28
End Level - 29
End Level - 30
End Level - 3
End Level - 7
End Level - 15
End Level - 25
End Level - 35
End Level - 45
End Level - 55
End Level - 65
End Level - 75
End Level - 85
End Level - 31
End Level - 32
End Level - 33
End Level - 34
End Level - 36
End Level - 37
End Level - 38
End Level - 39
End Level - 40
End Level - 41
End Level - 42
End Level - 43
End Level - 44
End Level - 46
End Level - 47
End Level - 48
End Level - 49
End Level - 50
End Level - 51
End Level - 52
End Level - 53
End Level - 54
End Level - 56
End Level - 57
End Level - 58
End Level - 59
End Level - 60
End Level - 61
End Level - 62
End Level - 63
End Level - 64
End Level - 66
End Level - 67
End Level - 68
End Level - 69
End Level - 70
End Level - 71
End Level - 72
End Level - 73
End Level - 74
End Level - 76
End Level - 77
End Level - 78
End Level - 79
End Level - 80
End Level - 81
End Level - 82
End Level - 83
End Level - 84