Full list of all 30 Gunpowder (Windows) achievements worth 300 gamerscore. It takes around 5-6 hours to unlock all of the achievements in the base game.
The base game contains 20 achievements worth 200 Gamerscore, and there are 2 DLC packs containing 10 achievements worth 100 Gamerscore.
Collected all 25 trophies in chapter 1-4
Collected all bonus items in Chapter 4
Destroyed Boss Grimshaw's symbol of oppression
Beat Mission 4-24 with all bonus items by only making 3 turntable changes
Collected all bonus items in Chapter 3
Did you really just blow up your own house?
Beat Mission 3-8 with all Bonus items by only making 8 Switch Track changes
Collected all bonus items in Chapter 2
Destroyed 4 walls with a single explosion in Mission 2-23
Destroyed 500 destructible objects
Swept up gunpowder in a single mission 5x
Detonated the plunger without igniting anything
Collected all bonus items in Chapter 1
Destroyed 50 innocent cacti in your trophy-lust
Found a hidden trophy
Blew up a safe, destroyed all the bonus items, and found a hidden trophy in a mission
Destroyed all Boss property and Cacti in Mission 1-6
Destroyed 12 Bonus Items
Received a time bonus on a mission
Destroyed a bonus item after destroying the Safe
Collected all piggy banks in chapter 5
Destroyed the safe and all piggy banks in Mission 5-20 without the waterfall extinguishing the fire
Collected all hidden trophies in chapter 5
Destroyed the snowman horde in Mission 5-9
Spared the snowman in Mission 5-6
Collect all bonus items in the Lost Levels
Beat Mission LOST-6 with all bonus items without the spark being extinguished by a wagon
Break the safe on Mission LOST-12 right before the flooding water washes it away
Beat Mission LOST-21 with all bonus items, without breaking a single crystal
Score a basket on Mission LOST-23