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.
Complete a level without shooting.
Complete a level without killing any enemy.
Beat the boss (hard mode).
Complete an area without taking damage.
Beat the fourth area (hard mode).
Beat the third area (hard mode).
Beat the second area (hard mode).
Beat the first area (hard mode).
Beat the boss.
Complete an area without landing.
Land a 100 combo.
Complete a level without visiting siderooms.
Complete a level without landing.
Have more than 5000 gems.
Beat the fourth area.
Land a 30 combo.
Have more than 3000 gems.
Beat the third area
Beat the second area.
Beat the first area.
Complete a level without taking damage.
Land a 10 combo.