Here is the full list of all 13 Metal Dead achievements. It takes around 3-4 hours to unlock all of the achievements on Windows.
Kill the source
Maybe you should knock first
Not even Arnie could survive that
Happy accidents will happen
Perfect balance of hot and cold
Mess around a little too much
Smoke the giant bud monster
Kill the baby plant
Mess around with some household chemicals
Complete a mind-numbingly menial task
Revive an old friend
Open the wrong crate
Introduce tire iron to cranium