Here is the full list of all 23 Downwell trophies - there are 5 bronze, 10 silver, 7 gold and 1 platinum.
Completed all other trophies.
Beat the boss (hard mode).
Beat the fourth area (hard mode).
Beat the third area (hard mode).
Beat the second area (hard mode).
Beat the first area (hard mode).
Have more than 5000 gems.
Complete an area without landing.
Complete a level without killing any enemy.
Complete a level without shooting.
Complete a level without visiting siderooms.
Complete a level without landing.
Complete an area without taking damage.
Land a 100 combo.
Beat the boss.
Have more than 3000 gems.
Beat the fourth area.
Land a 30 combo.
Land a 10 combo.
Beat the third area
Beat the second area.
Beat the first area.
Complete a level without taking damage.