Note that the number of Squad Points I’ve allocated is based on reaching Level 30. In this section, I’ll talk about the different Ammo, Tech and Bonus Powers that you should focus on to make the most out of your Assassin Infiltrator Build. As such, this makes them deadlier from any range possible. The Assassin Specialization boosts the Infiltrator’s potential by increasing their Weapon and Power Damage.
If you’re only going to shoot enemies at close range, which used to be this Class’s weakness back in Mass Effect 1, you can switch to wielding a Submachine Gun. Heavy Pistols can hit fast-moving targets from close to mid-range distances despite its moderate rate of fire. In addition to this Weapon, Infiltrators are skilled at using Heavy Pistols and Submachine Guns. As such, it’s best to activate Tactical Cloak first before shooting with a Sniper Rifle. While remaining in this state, Infiltrators gain Weapon Damage bonuses. Tactical Cloak instantly turns Commander Shepard invisible to move undetected for the kill. The Infiltrator is the stealthiest among all of the Mass Effect 2 Classes, which is enhanced due to their Unique Class Power, Tactical Cloak, and Sniper Rifle Proficiency.
Mass Effect Legendary Edition Build Guide: Infiltrator (Mass Effect 2)