If It Had to Perish Twice has a total of eighteen epilogues, some more easily accessible than others, most with multiple different combinations of origin, companion, and plan. Below is a list with the general method of achieving them.
I Won’t Let You Do This
In a Water Treatment or Algae Farm plan, tell Tiffany your plan without revealing you have knowledge of the “secret chemical.”
Get arrested. Either take Moh with you on a Water Treatment or Algae Farm plan and attempt to damage something or go ahead with the plan when police are patrolling the area.
For Your Own Good
Reveals the true nature of the “secret chemical.” Unlock “secret chemical” knowledge and take Tiffany or Moh with you into the disinfectant building at the water treatment plant.
For Our Own Good
Unlock “secret chemical” knowledge and go with Klik, Tiffany, or by yourself into the disinfectant building at the water treatment plant.
Have the Water Treatment origin, and use it to pump excess chlorine into the water supply via the Water Treatment plan.
This Is Fine
Successfully break a water pump int the Water Treatment plan.
Reveals a secret of the Lios. Take Klik with you into the chemical shed at the algae farm.
With the Algae Farm origin (and thus knowledge of how the algae works), pour herbicide into the algae tanks.
Flinging Itself to Pieces
With the Algae Farm origin in the Algae Farm ending, pretend to destroy the centrifuge.
Stand Back from the Centrifuge
With the Water Treatment origin in the Algae Farm ending, successfully destroy the centrifuge.
Pull the Thread
Successfully throw the valves at the Algae Farm
With the Dome Tech origin and plan, take Tiffany with you at the end.
With the Dome tech origin and plan, go alone or with anyone other than Tiffany.
Tool of the Oppressors
If Sheriff Jorge confronts you at the end of the third day, tell him your plan.
Lesser of Two Evils
With Moh with you in an Algae Farm or Water Treatment plan, let him convince you not to go through with it.
The Road to Hell
Fail to actually perform any damage despite your intentions to do so. Attempt to kill the algae without the Algae Farm origin.
If It Had to Perish Twice
Execute a Water Treatment or Algae Farm plan on your own, then choose not to go through with it at the last minute.
Those Who Favor Fire
Take Ashanti with you on an Algae Farm or Water Treatment plan with high enough affection that she changes her mind at the last minute.