There are 20 achievements with a total of 200 points.
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Estimated achievement difficulty: 5/10
Offline: 20 
Online: 0 
Approximate time: 1-5 Hours
Minimum number of playthroughs needed: 1playthrough
Missable achievements: No
Does difficulty affect Achievements: No
Unobtainable/glitched Achievements: No
Extra equipment needed? Windows Phone 7 or 8
Is there DLC? No
Welcome to Pac-Man on Windows Phone! Everybody knows Pac-Man, but if you don't, Pac-Man is a classic arcade game where you control Pac-Man, and your objective is to clear a maze of its dots and power pellets while avoiding the four ghosts Blinky, Pinky, Inky, and Clyde. Power pellets allow you to turn the tables on the ghosts, and eat them for bonus points. Clearing a maze resets the board, and the ghosts become faster and more aggressive. Each stage has bonus fruits which appear from time to time.
The game play itself is pretty simple, but the achievements can be difficult. Unlike the XBLA version, you cannot continue if you get Game Over, and there is no Stage Select. Losing all your lives will set you back to Stage 1. Achievements that require you to eat a set number of things will have to be accomplished in one game.
The controls take some getting used to. There is a virtual stick placed at the bottom of the screen, but it is not necessary to use it. You can swipe anywhere on the screen to move Pac-Man around. It is recommended to switch to the "FLICK" control scheme, as this does not show the stick whenever you touch the screen. As with all Pac-Man games, it is best to change directions before Pac-Man gets to an intersection; this allows you to move fluidly through the maze, without stopping and starting. Part of the difficulty of this game is overcoming the controls.
Eat all the dots, ghosts and fruits, and don't die! Your goal is to reach the 13th stage, eat two of each fruit in the process, and shoot for 50,000 points. It sounds simple, but the ghosts will ambush you, so try to anticipate their movements. The first five stages shouldn't be too tough, but the difficulty ramps up with stage 6; ghosts get faster and more aggressive, and the power pellets don't last as long. With practice, your skills will improve, and you'll get further into the game.
Get all the low scoring (10 and under) achievements out of the way first. These are obtainable in the first five stages, and are relatively easy to get. Whenever you get to a new stage, be sure to eat two of each fruit to get the related achievement for that fruit. As you reach an intermission (after stages 2, 5 and 9), you'll get a coffee break achievement.
As you get better at the game, you will start to earn the 15 achievements, and can tackle 50,000 POINTS! if you haven't gotten it yet. You will likely need to focus on getting the late game achievements (each worth 20), which are the toughest in the game: ADVANCED COFFEE BREAK, BELL, KEY and TOTAL FRUIT DOMINATION! Thankfully, you can use 30-year old patterns to help get these higher level achievements.
Once you have all the level and fruit achievements, you might still need MASTER PASSER, which is the only achievement not tied to a specific level. If that's the case, just keep playing games until you successfully pass through a ghost three times.
Pac-Man on Windows Phone isn't a perfect or easy game, but it is a fun diversion. Getting all 200 is something to be proud of, as it takes quite a bit of skill to achieve.
[x360a would like to thank Hamket for this road map]
A complete maze of dots and power pellets is worth 2,600 points. This can easily be earned on stage 1 as long as you eat two ghosts while they are blue. Eat a cherry for an extra 100 points each. Otherwise, you'll get it on stage 2.
Stay alive for 3 minutes without eating any pac-dots or power pellets.
This is tricky to do legitimately, but can be done on stage 1 by eating all but one dot in the maze, then allowing the ghosts to chase you for three minutes.
A much easier way to get this is to have Pac-Man "hide" in the corner directly right and up from his starting position. As long as no ghosts see you enter this spot, they will never find you. Just wait there for three minutes for the achievement to unlock, then carry on.
You can see the hiding spot in the video below, at the 25 second mark.
A complete maze of dots and power pellets is worth 2,600 points. Eating all four ghosts with each power pellet gives you 3,000 points, for up to 12,000 more points per stage. Do your best to eat as many ghosts and bonus fruits as possible, and you'll likely get this around stage 7 or 8.
If you are proficient at eating all four ghosts with each power pellet, you can get this achievement in Stage 4. (12,000 * 4 for 48,000 ghost points, and 2,600 * 4 for 10400 dot points, not to mention any bonus points from fruit.)
The second coffee break occurs after Stage 5 (Apple 1).
It can be tricky to get to this intermission, but overall it's not too tough. Ghosts are getting fast, and the power pellets don't last as long by this point, so try to focus on clearing each maze quickly.
This requires you to pass through a ghost three times without dying. This is cumulative, and does not all have to be done in one game.
This is possible due to the way the game calculates collision between Pac-Man and the ghosts. However, it is extremely difficult to force this to happen, and will likely happen naturally and randomly, during the course of normal play. Passing through a ghost while it is blue from a power pellet does not seem to count towards this; the ghost must be its normal color.
You can see this in action at the 40 second mark in the video below.
This is the most difficult achievement in the game, as it requires you to eat one of each fruit, all in one game with only four lives. There are no continues and no stage select, so you will need to have quick reflexes and master the controls in order to achieve this. If you get Game Over, you start back at zero fruits eaten.
Fortunately, the ghosts in Pac-Man have predictable behavior, and experts developed patterns to guide Pac-Man around the maze avoiding certain death, all while getting all bonus fruits.
The patterns for the first four stages (top two rows) don't work 100% for this version of the game, so it's best to freestyle those stages. If you die in any stage up to stage five (Apple 1), it's best to restart.
The bottom patterns work remarkably well for stages five and up, which is where you'll need them. You'll need to practice the path, and make all your turns flawlessly. Remember to swipe the controls in advance of the actual turn.
Once you get through all four parts of the bottom pattern, move to each corner and eat the power pellets quickly. Do your best not to die. If you do die, the pattern becomes worthless, and you'll need to improvise to finish the current stage.
With time, you should be able to get to stage 13 (Key 1), and eat a key to get the achievement.
REMINDER: Remember to keep playing after you've unlocked this achievement, as you might still need one more key for the KEY achievement.
Thanks to montrossity for suggesting the use of patterns.