Bad Father

Bad Father is an achievement that requires the player to survive in game for 100 days. The steam achievement also explicitly states that you have to 'Survive 100 days without finding your son', implying that you cannot get the achievement by not saving Timmy in the Sahara Laboratory and then pass the 100 day mark. Furthermore, this cannot be achieved using multiple saves, it has to be done on one.

Console Command Method
Using Console Commands, the player can obtain this achievement. Once Console Commands have been activated, complete the following:
 * 1) Use commands   or
 * 2) Type in   - People who have stronger PC can use   to speed up even more. Start with lower numbers then work your way up to see what you PC can handle. (Can confirm value 5000 didn't cause any performance issues in my case so don't be afraid to experiment with high values - geforce 1060, i7 8700k, 16gb ram.) Increasing the game timescale only increases the speed at which time-based events progress (day and night and the progress of hunger and thirst), but not the speed at which the game runs, so it is relatively easy on your computer.
 * 3) If you don't have a good PC, try changing the screen resolution of the game, the graphics quality and play it windowed.
 * 4) Leave it to run until it reaches the 100 day mark. AFK is recommended.

EPILEPSY WARNING A quick note should be made with this method. If you turn up the game timescale very high (on the order of 1000) the game flashes from completely dark to very bright every few seconds. So much so, that I felt the urge to look away after a few in-game days. I can imagine that to people with photosensitive epilepsy this can cause problems.