My current status with observing Messier objects:
- Messier 1 (observed)
- Messier 2 (observed)
- Messier 3 (observed)
- Messier 4 (observed)
- Messier 5 (observed)
- Messier 6 (observed)
- Messier 7 (observed)
- Messier 8 (observed)
- Messier 9 (observed)
- Messier 10 (unobserved)
- Messier 11 (observed)
- Messier 12 (unobserved)
- Messier 13 (observed)
- Messier 14 (observed)
- Messier 15 (observed)
- Messier 16 (observed)
- Messier 17 (observed)
- Messier 18 (observed)
- Messier 19 (observed)
- Messier 20 (observed)
- Messier 21 (observed)
- Messier 22 (observed)
- Messier 23 (unobserved)
- Messier 24 (unobserved)
- Messier 25 (unobserved)
- Messier 26 (observed)
- Messier 27 (observed)
- Messier 28 (observed)
- Messier 29 (observed)
- Messier 30 (observed)
- Messier 31 (observed)
- Messier 32 (observed)
- Messier 33 (observed)
- Messier 34 (observed)
- Messier 35 (observed)
- Messier 36 (observed)
- Messier 37 (observed)
- Messier 38 (observed)
- Messier 39 (observed)
- Messier 40 (observed)
- Messier 41 (observed)
- Messier 42 (observed)
- Messier 43 (observed)
- Messier 44 (observed)
- Messier 45 (observed)
- Messier 46 (observed)
- Messier 47 (observed)
- Messier 48 (unobserved)
- Messier 49 (observed)
- Messier 50 (observed)
- Messier 51 (observed)
- Messier 52 (observed)
- Messier 53 (observed)
- Messier 54 (observed)
- Messier 55 (unobserved)
- Messier 56 (observed)
- Messier 57 (observed)
- Messier 58 (observed)
- Messier 59 (observed)
- Messier 60 (observed)
- Messier 61 (unobserved)
- Messier 62 (observed)
- Messier 63 (observed)
- Messier 64 (observed)
- Messier 65 (observed)
- Messier 66 (observed)
- Messier 67 (observed)
- Messier 68 (observed)
- Messier 69 (observed)
- Messier 70 (observed)
- Messier 71 (observed)
- Messier 72 (observed)
- Messier 73 (observed)
- Messier 74 (observed)
- Messier 75 (unobserved)
- Messier 76 (observed)
- Messier 77 (observed)
- Messier 78 (unobserved)
- Messier 79 (observed)
- Messier 80 (observed)
- Messier 81 (observed)
- Messier 82 (observed)
- Messier 83 (unobserved)
- Messier 84 (observed)
- Messier 85 (observed)
- Messier 86 (observed)
- Messier 87 (observed)
- Messier 88 (observed)
- Messier 89 (observed)
- Messier 90 (observed)
- Messier 91 (observed)
- Messier 92 (observed)
- Messier 93 (unobserved)
- Messier 94 (observed)
- Messier 95 (observed)
- Messier 96 (observed)
- Messier 97 (observed)
- Messier 98 (unobserved)
- Messier 99 (observed)
- Messier 100 (unobserved)
- Messier 101 (observed)
- Messier 102 (observed)
- Messier 103 (observed)
- Messier 104 (observed)
- Messier 105 (observed)
- Messier 106 (observed)
- Messier 107 (unobserved)
- Messier 108 (unobserved)
- Messier 109 (unobserved)
- Messier 110 (observed)
Eighteen to go, it looks like, although I strongly suspect I've seen many of these and forgotten to make note of it. For the record, the remaining Messier objects are:
- Messier 10 - Globular cluster
- Messier 12 - Globular cluster
- Messier 15 - Globular cluster
- Messier 23 - Open cluster
- Messier 24 - star cloud
- Messier 25 - Open cluster
- Messier 48 - Open cluster
- Messier 55 - Globular cluster
- Messier 61 - Galaxy
- Messier 75 - Globular cluster
- Messier 78 - Diffuse nebula
- Messier 83 - Galaxy
- Messier 93 - Open cluster
- Messier 98 - Galaxy
- Messier 100 - Galaxy
- Messier 107 - Globular
- Messier 108 - Galaxy
- Messier 109 - Galaxy