The achievement «Not Today, Thank You» is given when an invisible player deflects mob projectile

If the player is under the Invisibility effect, the mob will shoot at someone, but definitely not at you, and you will deflect with your shield his projectile that was not fired at you, you will get the achievement «Not Today, Thank You». Reproduce:

1. Get the invisibility effect run the command: /effect give @s Invisibility infinite 0 true

2. Give yourself shield run the command: /give @s shield

3. Summon skeleton run the command: /summon skeleton

4. Give it a fire resistance effect run the command: /effect give @n[type=skeleton] fire_resistance infinite 0 true

5. Switch to survival mode.

6. Stand between the skeleton and the iron golem, but don't get too close to it so as not to be discovered.

7. Make sure that the skeleton deliberately shoots an arrow at the iron golem and then deflect its projectile with a shield.

You will get the achievement «Not Today, Thank You»

I don't think the video is necessary.