What are the conditions to get the "Who Needs Tygan?" achievement?

The info text for the Steam achievement "Who Needs Tygan?" reads "Beat the final mission using only conventional gear".

What exactly does conventional gear mean in that context?

xcom-2

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Who needs Tygan requirements?

Basically, you must stick to Tier 0 items, which means basic soldier weapons (Assault Rifle, Pistol, Shotgun, Cannon, Sniper Rifle, Sword, Gremlin Mark I, Psi Amp, Grenade Launcher) and Frag Grenades.

How do you get exquisite timing achievement?

How to unlock the Exquisite Timing achievement

Month 1. March 05 - Lab Research Completed: Alien Biotech. ...

Month 2. April 05 - Mission: Skulljack an ADVENT Captain / Kill Codex. ...

Month 3. May 02 - Shadow Chamber Research Completed: Codex Brain. ...

Month 4. June 01 - Mission: Investigate Codex Brain Coordinates (Recover Psi Gate)

What is the last mission in XCOM 2?

The Alien Fortress Assault, codenamed Operation Leviathan, is the final storyline mission of XCOM 2. The mission is unlocked immediately after the ADVENT Network Tower Assault (Operation Empty Mask).

XCOM 2: Final Mission, Who Needs Tygan? Combat Protocol Victory!

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