Here is the full list of all 19 Obscure II Obscure: The Aftermath achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Over-consumption of tea is not recommended.
Go to the Delta Theta Gamma party.
Meet up with Kenny and Amy at the Delta Theta Gamma party
Find Corey's car and get to the hospital.
Go through the hospital.
Find Amy at the Fallcreek dam.
Get to Jedidiah's house.
Get to the main yard at Leafmore.
Jedidiah won't make any more trouble.
Finish the game.
Obtain every available weapon during a game.
Open a chest.
Open all of the chests.
Prepare a serum, an improved serum and a powerful serum.
Consume 10 energy drinks.
Heal a teammate 10 times.
Recharge electric weapons 10 times.