http://skyrimcalculator.com/#22046
I'm not a big fan of perking mutually exclusive methods of combat. For instance, you're not likely to snipe and backstab against the same enemy. I would pick one or the other.
If you go full Archery, you can still backstab effectively with daggers and minimal perk investment in One Handed. If you go full One-Handed, I'd suggest using Swords and enchanting your armor with Fortify One-Handed enchants. You'll do less Sneak damage, but you'll do far better if and when you're spotted and end up toe-to-toe.
Dump Critical Charge in One Handed. That's an opener for DW Warriors; useless for Assassins who will be sneaking in for a backstab.
The Light and Heavy Armor perk trees are pretty weak, so you're generally best served by putting only enough points in to become armor capped, or to avoid it entirely. If durability is important to you, consider taking Elven Smithing; 2 points in Smithing, 8 in Enchanting, and 3 in Light Armor can get you a mitigation-capped set of armor with custom enchants on it. Otherwise, I'd stay away from the Light Armor tree entirely. Durability is always an issue for assassins, because unless you're purposefully training/ power leveling your Light Armor Skill, it will tend to be underleveled since you don't go toe to toe with enemies often. Either craft your way to maximum durability or make peace with being a glass cannon.
Smart move only taking 1/5 in Stealth. Points 2-5 give very little bang or the buck, and you won't need them at higher levels. Definitely fill out the Sneak tree. Shadow Warrior is incredible, and if you're set on using daggers, it will allow you continually sneak attack enemies who are in your face.
Illusion magic is incredibly powerful, but I'm not a big fan of it. Casting Rage on a group of enemies from afar is much too passive for my liking, and Invisibility isn't necessary once your Sneak is high enough. If you want it as an escape mechanism, you can always get it through pots.
Consider putting some points in Pickpocketing. Disarming or poisoning an enemy before you backstab can be very useful, and adds another entertaining dimension to sneaking. Extra Pockets is a very useful perk in its own right.