Microsoft Ultimate Word Games

There is no time requirement for this achievement, meaning you can complete each day's challenges as they come, wait until the last day of the month and complete them all for that month, or change the date on your device to an earlier month to complete them all. Just be aware that Crossword Daily Challenges don't exist before April 2017 when the game was released, since crossword puzzles aren't randomly generated like the other two game modes. This all means that you can take your time and work through every challenge for every day of a given month. That being said, it's most efficient if you combine this achievement with the "Marathon" achievement.

As far as the challenges themselves, each day has a Wordament challenge where you have to use crystal letters in words, a Jumble challenge where you have to spell specific words on the list to defuse bombs, and a Crosswords challenge where you have to answer certain clues to earn keys to unlock a final challenge which you then have to solve. The difficulty of each challenge is randomly chosen, and can be easy, medium, hard, or expert. Even expert difficulty isn't hard on each of the game types. Here's a little more detail about each type of challenge:

Wordament

The goal here is to collect crystals by using the blue letters in words. If you use at least 3 crystal letters in one word, the last letter of that word will turn into a rainbow tile that doubles your crystal value when you use it in a word. Naturally this means you should be aiming to make as many crystal tiles as possible. The catch is that you can't duplicate words, so once you use a word, you can't spell it again, even if you're using tiles in different locations, so plan accordingly. By that I mean don't spell words longer than are necessary to use the crystal tiles, otherwise you're wasting opportunities for longer words later.

For the easy and medium difficulties, you have as many or more moves than how many crystals you need, so these are incredibly easy. Just use at least one crystal per word and you'll beat it. For hard and expert, you're going to have to make some rainbow tiles. Just be aware that new blue crystal tiles are generated each time you use all the blue tiles. The rainbow tiles don't affect this. So if you have a rainbow tile and there's only one crystal tile left, or even two, it's better to save the rainbow tile, use the crystal tiles, and then when more crystal tiles spawn, make a word with 2+ crystals and a rainbow. This will double your crystal value of the word AND generate another rainbow. This makes hard and expert difficulties very easy too, they'll just take a little longer.

Jumble

Here you have to find words that correspond to the bombs on the word list. Naturally start with the shortest bomb fuse first. At first it will be a matter of making an educated guess as to what word corresponds to the bomb by seeing if it's near the beginning, middle, or end of the list, and then guessing a word that should be in that range. From there, you can narrow down each bomb word.

If you have no interest in guessing words or aren't good at anagrams, you can use an anagram solver such as THIS ONE to give you all the words, then just figure out which ones go with each bomb.

Crosswords

Each crossword has keys in set boxes, and you need to fill that box with the correct letter and then "Check Word" on it, and if it's correct, it'll use that key on the locked clue in the upper right. There is no time limit here, so no need to rush. In general, the crossword clues and answers are very Tuesday-level difficulty, so it's unlikely you'll need to solve extra parts of the puzzle, but that is an option too if you need more crosses to help you figure out a word.

Once you have the minimum number of keys required to open the lock (which is the only thing the daily challenge difficulty affects), you can now try to figure out the final answer. The clue is usually something vaguely related to the answer, and isn't a straightforward crossword clue. If you need more help, you can continue to earn more keys on the grid to reveal more letters of the final answer, making these challenges very easy.