Here is the full list of all 30 Vertical Drop Heroes HD achievements.
Keep a rescued Thief alive long enough for him to drop a Red Gem.
Complete any of the mini side-quests given by an NPC in a level.
Rescue a friendly hero from a cage. You can either use a key or find a way to break the cage.
Defeat 25 Goblin Spearmen.
Use a blue teleporter to return to the top of the level.
Purchase any 5 unlocks to gain a Crossbow: nail your enemies to the wall!
Purchase any 20 unlocks to gain a Pickaxe: dig your way to the depths of the dungeon!
Purchase all 50 unlocks to gain a Katana: hack and slash your way past your enemies!
Complete a run in Normal mode to gain a Warhammer: smash your enemies into the scenery!
Kill 150 enemies in a single run to unlock the Reaver: slay your enemies and absorb their souls!
Complete at least 3 levels in Pacifist mode on a single run to unlock the Bone Dagger: stab your enemies from behind for mega damage!
Achieve a score of 25,000 in New Game Plus to unlock the Musket Gun: blast your enemies to smithereens!
Complete the game 3 times to unlock the Infinity Sword: turn yourself into the ultimate Glass Cannon!
Jump into electrified water to get this achievement! But seriously, don't even try this in real life.
Complete any level in split screen multiplayer mode.
Unlock a Green Crystal, skip at least one level using the Teleportation Shrine, and go through the Portal in the Temple of Knowledge.
Complete a level without triggering any alarms in single-player mode.
Complete a level without using any Skills or Powers in single-player mode.
Upgrade the Apothecary, Blacksmith, and Pacifist Monk to level 10.
Complete a game in Normal mode without using the Teleportation Shrine.
Open a door blocking a Portal before the Boss of the level is defeated. You'll need five keys.
Turn an enemy into a flying sheep... and then get rid of the sheep.
Summon a Dragon. ROAR.
Defeat 9 enemies in a level while remaining in Pacifist Mode... for example, by using Swap when you are over a pit of spikes, or by letting rescued heroes do your dirty work.
Gain enough experience to reach Level 21.
Walk into a Cave Spider's web.
Break yourself free after being frozen by an Ice Bolt by repeatedly pressing Jump.
Activate a Shrine of Frost, a Shrine of Flames and a Shrine of Sparks in a single run.
Open a total of 20 Treasure Chests in a single game. Breaking open the chests also count.
Collect 12 Pacifist Orbs in a single level.