Multiple IF formula to input text dependent on value range

if you want an if statement instead of what FalconDude gave you then this...
=IF(G8<=59%,"Fail",IF(G8<=79%,"Pass - Action Required",IF(G8<=100%,"Pass","N/A")))
Now, the problem with what you wrote is that you completed each if statement with this...
IF(G8<=59%,"Fail", "N/A")+IF((AND(G8=60%,G8<=79%),"Pass - Action Required", "N/A"))+IF,(((AND(G8>=80%,G8<=100%), "Pass", "N/A"))))
this... IF(G8<=59%,"Fail", "N/A") is an IF/Then statement in itself and once the criteria is/are met it stops working. The your plus signs are trying to tell it to add things together which won't work for text.
hope that helps clarify why it wouldn't work for you.

EDIT: by the way, you don't need the and statements for between this and that because once the IF statement becomes true it stops. So if the value in G8 is greater than 72% the part where it is equal to or below 59% is false so it goes to the next value and sees that it satisfies he part about it being less than or equal to 79% so now it stops.