You would have a state or multiple states that check each int var (I assume you trigger the check through an NPC, as well as when you complete each task). For example, if you collect 100 coins, set some bool to true. Then in check quest state you can use "bool all true" to check if each one has been completed, then set your quest var to true.
There's a lot of ways to do it...not sure if this is the best.