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