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.
Achieve your first instant kill on a zombie.
Enter La Vendida Island
Unlock your first skill
Enter La Sonada Island
Enter Santa Barbara Island
Complete a local or online challenge with another player.
Find the 20 special plants of the Herbarium.
Complete the story mode in "Normal" difficulty.
Complete a challenge with a "S" ranking.
Complete the 12 secondary quests of Kovac's monkeys.
Reach "Survival hobbyist" ranking tag (Challenge mode)
Complete the story mode in "Iron man" difficulty.