Here is the full list of all 45 Downbreak achievements.
Unlock your first reward.
Achieve an "all flags" bonus once.
End one level with no damage.
End one level before the timer runs out.
End a tower with all your initial lives.
Get all bonuses in any level.
Destroy 5 mines with one click.
Destroy 35 boxes in one click.
Destroy 55 boxes in one click.
Destroy 80 boxes in one click.
Reach the bottom of a level with only one click.
Finish the Lost Woodlands Chapter.
Finish the Snowy Ridges Chapter.
Finish Unforgiving Sands Chapter.
Finish The Dark Canyons Chapter.
Finish The Sacred Lands Chapter.
Finish Glaciers of Eternity Chapter.
Complete the Lost Woodlands at 100%.
Complete the Snowy Ridges at 100%.
Complete Unforgiving Sands at 100%.
Complete The Dark Canyons at 100%.
Complete The Sacred Lands at 100%.
Complete Glaciers of Eternity at 100%.
Unlock all the game rewards.
Score 100% in any classic mode level.
Score 100% in any classic mode group.
Score 95% completion in Classic Mode.
Complete a challenge mode level.
Complete a challenge mode group.
Complete all levels in Challenge Mode.
Reach Floor 15 in infinite tower I.
Reach Floor 15 in infinite tower II.
Reach Floor 15 in infinite tower III.
Reach Floor 15 in infinite tower IV.
Reach Floor 15 in infinite tower V.
Reach Floor 15 in infinite tower VI.
Spot the evil shadow.
Beat a tower in less than 20 seconds.
Carry 3000 Gold in your pockets.
Max the time counter to 99 seconds.
Perform a 10x combo
Perform a 15x combo
Perform a 20x combo
Get your first S-rank
Beat one tower using 2x skill multiplier