Here is the full list of all 20 Tesla vs Lovecraft achievements.
Kill 50 Shoggoths
Complete Chapter 2
Kill 500 Fire Vampires
Collect 100 crystals
Kill 50 Polyps
Purchase a meta upgrade
Complete Chapter 1
Kill 50 Parasites
Kill 1000 Spiderghouls
Kill 200 Spawns of Dagon
Recover and Operate the Mech
Choose an EPIC perk
123 Deep Ones must die.
Complete Tutorial
Recover lost Tesla Backpack
Repel 100 Tentacles
Activate the Wardenclyffe and save the world.
Activate the Wardenclyffe and save the world in Aether Plane.
Activate the Wardenclyffe and save the world in Eldritch Plane.
Complete Chapter 3