Need Some Help on Runes

Its been a long time since i played assassin so i dont remember which runes to use. I just made my sin Hello Piggy and got her elite lux armor, i bought runes and insignias but i dont know if i did them right

Headpiece: Minor Dag/Nightstalker
Chestpiece: Minor Critical/Survivor
Arms: Minor Shadow/Saboteur
Leggings: Minor Vigor/Infiltrator
Shoes: Vitae/Vanguard

Health: 535
Energy: 30

The runes look fine, a superior vigor would be preffered, but if minor is all you can afford that works. The rest of the runes are fine.

Insignias only work on the piece of armour that is hit. You will not be getting heaps of +armour when you get hit. Each piece of armour has a change of being hit, if that piece is hit, that piece armour is used for armour calculations. I would recommend putting Nightstalkers insignias on all armour pieces, Survivors can also work well.

Very correct, it is a chance of hit of 3/8 on chest piece 2/8 on legs and 1/8 on the others.

i advise attunements a vigor a minor crit strikes minor dag mastery and radiant insignias it is what i run on my sin and it works great

As far as the runes go they seem to be OK, the insignias do not stack with one another, they only work on the selected armor piece. What I would run would be:

Head: +1 Crit/Survivor
Chest: +30HP (+50HP)/Survivor
Arms: +10HP/Survivor
Legs: +10HP/Survivor
Feet: +10HP/Survivor

The extra health is really nice, especially for an Assassin. Or the armor alternative:

Head: +1 Crit/Nightstalker
Chest: +30HP (+50HP)/Nightstalker
Arms: +10HP/Nightstalker
Legs: +10HP/Nightstalker
Feet: +10HP/Nightstalker

Just my preference.

I notice that every one of your runes and insignias is different. Is this because you don't know that some of them stack?

My sin's current setup:

Head: Survivor/Major Dagger or Survivor/Superior Shadow (perma)
Chest: Radiant/Superior Vigor
Hands: Survivor/Attunement
Legs: Radiant/Minor Critical
Feet: Survivor/Attunement