Collection of URL extensions to filter achievements

During the recent Twelve Days of Christmas 2021 Challenge, a post by helado frito got me thinking, that a thread like this should exist, as I couldn't find one with this information already.

This thread will function as a collection of URL extensions to filter achievements.

Quick introduction how it works.
On this page you can see all existing achievements:
https://www.trueachievements.com/xbox-achievements.aspx

And on this page you can see all of your achievements: (you have to change my GT to yours in the URL)
BAMMphil's Achievements

You can filter those lists with the filter drop down on the site, or you can use the URL do to the same and also access a couple filters which are not available in the options.

For those you have to edit the URL (which is basically the adress at the top of your browser, in case you didn't know)

In order to add extensions to the URL, your first extension has to use a ? in the beginning, following extensions can be appended with only an &.

For example if you want to filter your achievements by the firstchar starting with A, you would add
?firstchar=A at the end.
If you would like to filter the achievements by only games not Apps, you would add
?titletype=Game at the end.
If you would like to filter by both you would add ?firstchar=A&titletype=Game in the end, additional ones would be added with & aswell.


Extensions I know about so far are:

- easy=1 (shows achievements you haven't unlocked yet) *
- secrets=1 (shows achievements which are secret) *
- oddgs=1 (shows achievements with odd GS values, like 1, 3, 7, ...) *
- bonuscontent=1 (shows achievements from DLC or Titleupdates) *
- rare=1 (only shows rare achievements (the ones with a diamond)) *

- titletype=Game (shows only games and not apps, I would assume you can switch to App somehow, =App does not work though)
- startswith=hello (shows achievements starting with the word hello, if you want them to start with hello_(hello and a space after) or 2 words divided by a space (like hello world) then you would use startswith=hello%20 or startswith=hello%20world (%20 just means space in URL)

- firstchar=X (allows to search for achievements starting with letter X)
- chars=X (shows achievements with names that are X characters long, not counting spaces)
- minratio=X (shows achievements with a ratio higher than X, replace X with a number like 2)
- maxratio=X (shows achievements with a ratio lower than X, replace X with a number like 5)
- gamerscore=X (shows achievements with a specific Gamerscore, e.g. replace X with 10, 20, ...)
- flagid=X (filters achievements by achievement flags, replace X with one of the following numbers:
3 = Online Game Mode, 4 = Offline Game Mode, 6 = Singleplayer, 9 = Main Storyline, 10 = Difficulty Specific, 11 = Stackable, 12 = Collectible, 13 = Cumulative, 20 = Time Consuming, 21 = Missable, 22 = Buggy, 25 = Shop, 27 = Level, 39 = Cooperative, 40 = Versus, 41 = Host only, 42 = External Content, 43 = Time/Date)
- platformid=X (shows achievements from Games on a specific platform, replace X with one of the following numbers: 2 = Xbox 360, a bit unsure about the rest so far )

- gpids=54 (shows games optimized for Series X/S)
- gpids=49 (shows achievements from games that are Free 2 Play)
- gpids=35 (shows achievements from 4K games)
- gpids=32 (shows achievements from games that are One X Enhanced)
- gpids=16 (shows achievements from games included in Gamepass)
- gpids=15 (shows achievements from games from Games with Gold)
- gpids=14 (shows achievements from games that are Xbox Play Anywhere)
- gpids=3 (shows achievements from games that are backwards compatible)
- gpids=1 (shows achievements from ID@Xbox or XBLA games)


* If a extension uses the number 1 or 0, those can usually be inverted to mean the opposite.
So easy=1 means achievements you DON'T have yet, while easy=0 means achievements you DO have.


If you know some more, feel free to comment below and I will add them to the list.