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.
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
Kill the baby plant
Smoke the giant bud monster
Perfect balance of hot and cold
Mess around a little too much
Happy accidents will happen
Not even Arnie could survive that
Maybe you should knock first
Kill the source