First, a reality check: There is no game titled "Call of Duty: Titans." You're likely thinking of Titanfall 2 (mechs + pilots), Call of Duty: Infinite Warfare (space combat), or Call of Duty: Black Ops III (specialists with "Gravity Spikes" etc.). No mainline CoD has "Titans" in the title.
It has no cheats (EasyAntiCheat). But the skill ceiling is movement. Learn bunny hopping, air strafing, wall-kick jumps, slide hops. Bryonato and FrothyOmen have the best tutorials. The campaign is a masterpiece—play it twice.
Stop searching for codes. Start grinding the firing range. That's the only "cheat code" that works.