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