Here is the full list of all 73 Mechs V Kaijus achievements.
Win Pokio harbor mission (normal)
Win Pokio harbor mission (easy)
Deploy over 250 Tanks
Kill 5.000 Kaijus!
Win the Pokio Households mission (normal)
Win the Pokio Households mission (easy)
Have 20.000 in cash in one mission
Kill 2.500 Kaijus!
Win the Pokio Limits mission (easy)
Win the Pokio Limits mission (normal)
Win the Placid Lake mission (Normal)
Win the Placid Lake mission (Easy)
Kill 500 Kaijus!
Win the First Encounter mission (Easy)
Win the First Encounter mission (Normal)
This is the first of many.
Kill 10.000 Kaijus!
Kill 25.000 Kaijus!
Kill 50.000 Kaijus!
Win the First Encounter mission (Hard)
Win the Placid Lake mission (Hard)
Win the Pokio Limits mission (hard)
Win the Pokio Households mission (hard)
Win Pokio harbor mission (hard)
Win Hammer of the Gods mission (easy)
Win Hammer of the Gods mission (normal)
Win The Bridge mission (easy)
Win The Bridge mission (normal)
Win The Bridge mission (hard)
Win the Hell on Earth mission (easy)
Win the Hell on Earth mission (normal)
Win the Hell on Earth mission (hard)
Win the Enter Hell mission (easy)
Win the Enter Hell mission (normal)
Win the Enter Hell mission (hard)
Kill the Giant Kaiju, Nematodah (easy)
Kill the Giant Kaiju, Nematodah (normal)
Kill the Giant Kaiju, Nematodah (hard)
Reach Wave 15 of Survival 1
Reach Wave 25 of Survival 1
Reach Wave 50 of Survival 1
Reach Wave 15 of Survival 2
Reach Wave 25 of Survival 2
Reach Wave 50 of Survival 2
Lose over 50 times
Launch Over 250 missiles
Launch Over 500 missiles
Deploy over 500 Tanks
Freeze over 2500 Kaijus!
Freeze over 5000 Kaijus!
Complete Episode 1 in Easy
Complete Episode 1 in Normal
Complete Episode 1 in Hard
Buy al the Tech!
Have 5.000 in gold
Buy research the Ultimate Weapon Charger mk1
Buy research the Ultimate Weapon Charger mk2
Drop down over 250 defences
Drop down over 500 defences
Drop down over 1000 defences
Drop 700 walls.
Drop 300 Tesla coils
Drop 250 Grinders
Drop 250 Anti Air
Reach Wave 100 of Survival 1
Kill the forest Titan
kill the Placid Lake Titan
Kill the Pokio Limits Titan
Kill the Pokio Households Titan
Kill the Pokio harbor Titan
Kill the Pokio Sky World Plaza Titan