Complete the following tasks to unlock the corresponding achievement. 
To view your achievements and stats in Steam, select "Community", then
"My profile", then "View all my games", then the game and view stats.

Achievement         How to unlock
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A Friend in Need  - Special 1: Find someone to help you.
A Friend Indeed   - Special 1: Follow the signal to its conclusion.
Alan, Wake Up     - Complete the game on Nightmare difficulty.
Boob Tube         - See what's on TV.
Departure         - Complete the game on Normal difficulty.
Ding!: Special 2  - Complete the elevator ride.
Drink 'Em Both Up - Put de lime in de coconut twice.
Energized!        - Use 100 batteries.
Heartbreaker      - Special 2: Have some poison poured in your ear.
Heavy Metal       - Survive the bulldozer attack.
Hypercaffeinated  - Discover all coffee thermoses.
Iron Horse        - Encounter a steam engine.
Right of Way      - Drive over 15 Taken.
Tick Tock         - Special 1: Discover 10 hidden alarm clocks.
Tornado Wrangler  - Defeat the tornado.