Complete the indicated task to unlock the achievement.

Achievement	How to unlock
A Place to Call Home (2,500 XP)	Collected 100 Animals.
Chatterbox (7,500 XP)	Participate in 50 Events.
Collector (5,000 XP)	Open 50 Clamshells.
Completionist (7,500 XP)	Open 100 Clamshells.
Explorer (2,500 XP)	Expand all Environments.
Forming a Herd (5,000 XP)	Add 50 friends.
Getting Friendly (2,500 XP)	Add 10 friends.
Giver (2,500 XP)	Sent gifts to 3 friends.
Golden Acorns (5,000 XP)	Spend 10 Acorns.
Heard Announcement (10,000 XP)	Participate in 100 Events.
Hey Big Spender! (5,000 XP)	Spent 100 Acorns.
News Meltdown (2,500 XP)	Participate in one Event.
One Big Happy Family! (7,500 XP)	Add 100 friends.
One More Go! (2,500 XP)	Use Revive on Scrat mini game 10 times.
Perfectionist (12,500 XP)	Open 500 Clamshells.
Read All About It! (2,500 XP)	Participate in 20 Events.
Scratlantis (10,000 XP)	Spent 500 Acorns.
Treasure Island (2,500 XP)	Open 3 Clamshells in one island.