Here is the full list of all 12 Mitosis achievements.
Grow a huge population of cells.
Grow aggressive cells with spikes.
Grow a population with at least three high evolved genes.
Many cells have to die. No matter how long it takes.
Grow many cells in short time.
Keep a tiny population alive.
Grow a heat resistant population.
Breed a lot of cold resistant cells.
Grow cells with many limbs.
Your cells have to perform mitosis many many times.
Wipe out your population as fast as you can!
Let your cells fight against each other.