Full list of all 12 How to Survive achievements worth 400 gamerscore. It takes around 15-20 hours to unlock all of the achievements on Xbox 360.
Complete the story mode in "Iron man" difficulty.
Reach "Survival hobbyist" ranking tag (Challenge mode)
Complete a challenge with a "S" ranking.
Complete a local or online challenge with another player.
Complete the story mode in "Normal" difficulty.
Complete the 12 secondary quests of Kovac's monkeys.
Find the 20 special plants of the Herbarium.
Enter Santa Barbara Island
Enter La Sonada Island
Enter La Vendida Island
Unlock your first skill
Achieve your first instant kill on a zombie.