[Fizzlemizz]

Using table[somevar] = "something" is great for accessing unknown table keys. If you know the key you want to use you can access it with dot notation table.key = "something"

Example in your case:

if C_Garrison.GetGarrisonInfo(TYPE70) then
        LEGION["avl"] = #GetAvailableMissions(FOLTYPE70)
        LEGION["pro"] = #GetInProgressMissions(FOLTYPE70)
        LEGION["fin"] = #GetCompleteMissions(FOLTYPE70)
end

could be:

if C_Garrison.GetGarrisonInfo(TYPE70) then
        LEGION.avl = #GetAvailableMissions(FOLTYPE70)
        LEGION.pro = #GetInProgressMissions(FOLTYPE70)
        LEGION.fin = #GetCompleteMissions(FOLTYPE70)
end

Just an FYI.
Then again, I dislike wasting keystrokes like using brackets around if statements or ending lines with semicolons etc. .