Ryse: Son of Rome

The first time you get to use the spears, just kill 10 enemies in a row with them. Job done. And you don't need to be near an enemy at the risk of taking damage. I just got it randomly that way.

The easiest way to get this achievement is at the end of the game. Without giving any spoilers, at the end of the game there will be a sort of cut scene where you just have to press X/Y to execute enemies, and I got the achievement near/at the end of the sequence, even though I had pressed a couple of buttons wrong.

To unlock 'Comboing My Way Through' is fairly simple, you just have to beat 10 enemies in a row without taking any damage.

This can be done on any difficulty, but is obviously easier on 'beginner'.

The only real tips are, use focus if there are lots of enemies followed by executions, and don't panic. When an enemy is going to attack you, just deflect his attack, and then launch your own attacks.

With proper use of the deflect, you should be able to do this very easily.