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
Mess around a little too much
Perfect balance of hot and cold
Kill the baby plant
Smoke the giant bud monster
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