Here is the full list of all 21 Mother Simulator achievements.
Win 10 gold medals
Took the baby's nipple
Won the seventeenth test
Won the sixteenth test
Won the fifteenth test
Won the fourteenth test
Won the thirteenth test
Won the twelfth level
Won the eleventh test
Won the tenth test
Won the ninth test
Won the eighth test
Won the seventh test
Won the sixth test
Went to the toilet and washed away after myself
Won the fifth test
Got a diaper in the basket from eight meters
Won the fourth test
Won the third test
Win the second test
Won the first test