I know a checklist for the nano missions may not really be necessary (hey, you know what nanos you have already) but I decided to do this for the sake of completion. I made this list from the list on the FusionFall Wiki, and decided to share it here in case anyone else would find it useful. Just print it out and mark off each mission as you do them. Use the Wiki missions list to check where each character is if you don't know. If you're not sure which missions you've already done you can check by going to your journal and clicking the completed missions tab.
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Level 0 - A Fusion Matter - Buttercup
Level 1 - Practice Pranks - Numbah Two
Level 2 - Get Reddy - Eddy
Level 3 - Scary Monsters - Eduardo
Level 4 - Lame Imitation - Blossom
Level 5 - Fizzy Rox and Roll - Wilt
Level 6 - Lab Accidents - DeeDee
Level 7 - Creature Discomfort - Numbah Five
Level 8 - Mistaken Eddentity - Edd
Level 9 - Scrapheap Scrap - Coop
Level 10 - Carnival Collection - Billy
Level 11 - Mutation Abomination - Prof. Utonium
Level 12 - Doppelganger Gang - Him
Level 13 - Leaderbored - Bloo
Level 14 - Squirrel Squad - Bubbles
Level 15 - Go, Demongo, Go - The Scotsman
Level 16 - Plant Problems - Grandpa Max
Level 17 - Skunk Support - Numbah One
Level 18 - Going Bananas - Mojo Jojo
Level 19 - Leet Cheats - Mandark
Level 20 - Things Look Grim - Grim
Level 21 - Lab Monkeys - Dexter
Level 22 - Souls For Sale - Vilgax
Level 23 - Alien Abductions - Ben
Level 24 - Hands Off - Mandy
Level 25 - Bird Beast - Coco
Level 26 - Pack Attack - Mac
Level 27 - My Monkays! - Numbah Three
Level 28 - Charmed Life - Hex
Level 29 - Alien Totem Pole - Juniper Lee
Level 30 - Tree Trouble - Numbah Four
Level 31 - Royal Ed-Viser - Ed
Level 32 - Ring Around the Collar - Courage
Level 33 - Plant a Seed - Samurai Jack
Level 34 - Demon Attack - Demongo
Level 35 - Prehistoric Plot - Tetrax