Before the psychopath battle with Ted at the Yucatan Casino, collect four steaks. Then, defeat Ted without hitting Snowflake in the process. Once Ted has been killed, continue running from Snowflake, but periodically drop the steaks as you go. Lead Snowflake in circles until she has eaten all the steaks, making sure not to attack her. Shortly after Snowflake is full, a cutscene will play, and you will get "The Skill To Survive" achievement.