Here is the full list of all 18 The Gallery - there are Episode 1: Call of the Starseed achievements.
Spend the night in the Beach tent.
Smash 15 special bottles.
Listen to all the tapes in the game.
Blink 1000 times.
Complete Episode 1.
Complete the Laboratory level.
Complete the Lower Sewer level.
Complete the Upper Sewer level.
Return all the starfish to the sea.
Light 5 fireworks.
Douse 6 candles.
Sink 5 volleyball shots in the Beach hoop.
Hold the radio on the Beach for three minutes.
Start a fire on the Beach.
Complete the Beach level.
Shoot 3 bells with one clip.
Complete the Tutorial level.
Pick up 4 items.