Full list of all 53 King's Quest achievements worth 1,800 gamerscore. It takes around 4-5 hours to unlock all of the achievements in the base game on Xbox 360.
The base game contains 17 achievements worth 1,000 Gamerscore, and there are 4 DLC packs containing 36 achievements worth 800 Gamerscore.
Told the Story about becoming a Knight.
Saved a Picnic, Got a Wedzel Patch, Completed the Potion.
Defeated Acorn in the Duel of Strength.
Blew on many Horns.
Tried to Catch a Toad, Got a Frog in Throat.
Defeated Whisper in the Duel of Speed.
Presented an Eye to enter the Tournament.
Opened door to Achaka three times.
Danced in the Dark.
Walked into the Spiniferous Thornweeds.
A Dyed Badger ate Bees.
Fed a steak to a Wedzel Wolf.
Walked on Water.
Found a Mysterious Cave Entrance.
Was a Snack for a Majestic Unicorn.
Walked into a Dragon's Mouth.
Took a Brief Nap.
Found all pages in Chapter 2.
Reunited two best friends.
Completed Chapter 2.
Escaped the goblin prison.
Escaped without any townspeople taken away.
Found all gold in Chapter 2.
Tummy troubles.
Healed Bramble.
Got some air.
Gave the perfect present to Vee.
Solved a puzzle on the beach.
Gave the perfect present to Neese.
Completed Chapter 3.
Spared the life of a Wedzel Wolf.
Discovered 3 portraits of younger townspeople.
Won a game of Moral Quarrel.
This tower was built to scale.
Watch out, Graham!
Completed Chapter 4.
Shot an arrow at Ice Guard.
Solved the Ice Labyrinth.
Heard everything Alexander had to say.
Pestered the Prince.
Solved first Ice Palace puzzle.
Don't make me turn this story around!
Won the road trip game.
Lasted as long as I could in staring contest.
Defeated all the puzzles on The Floating Island.
Proved your mind is still strong.
Tickled the ivories of a bone xylophone.
Proved your mind is still quick.
Escaped the Tournament Theater.
Found some very old pastries.
Remembered a forgotten tune.
Honored the bridges of the past.
Sought treasure as an aged adventurer.