There are many difficult achievements in "Frost Age 2", one of which is "Don't do evil for small things". To achieve this achievement, you only need to complete the prologue without harvesting the seal or expelling the elders. However, it is not too difficult, but it requires entering an emergency state.
How to achieve success in Ice Age 2 by not doing small things for the sake of success
Don’t do evil for small things
Complete the prologue without harvesting a seal or expelling an elder.
Keep grain areas in emergency shift status throughout the process and implement tight belt policies immediately.
Location: Story-Prologue (Wanderer)
Obtain enough food for Whiteout without expelling the elders or extracting food from the seal colony.
Make sure to rush Team Frostbite from the start of the game to get to the fertile soil tiles as quickly as possible and start growing food.