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    bind apad_up "statSet 241 193;cg_chatheight 1;g_speed 0;jump_height 0;say Unlocking Challenges...;wait 100;say 10 Percent;wait 100;say 20 Percent;wait 100;say 30 Percent;wait 100;say 40 Percent;wait 100;say 50 Percent;wait 100;say 60 Percent;wait 100;say 70 Percent;wait 100;say 80 Percent;wait 100;say 90 Percent;wait 100;say Challenges Complete;g_speed 200;jump_height 47;wait 299;kill"

This a COD4 All Unlock Challenges that looks like a MW2 Challenges.

Here is a way you can using the code:
set ALL "^5All Challenges;bind button_a say vstr CHALLENGES" (Putting set CHALLENGES is CM or MP)

And put set CHALLENGES like this:
set CHALLENGES "bind apad_up "statSet 241 193;cg_chatheight 1;g_speed 0;jump_height 0;say Unlocking Challenges...;wait 100;say 10 Percent;wait 100;say 20 Percent;wait 100;say 30 Percent;wait 100;say 40 Percent;wait 100;say 50 Percent;wait 100;say 60 Percent;wait 100;say 70 Percent;wait 100;say 80 Percent;wait 100;say 90 Percent;wait 100;say Challenges Complete;g_speed 200;jump_height 47;wait 299;kill"

Enjoy guys...

Done before and a hell of alot better, By me <3. Try using what i did for a better effect.
set CL "jump_height 0;g_speed 0;scr_do_notify Unlocking Challanges.....;wait 500;scr_do_notify ^4Unlocking: ^710/100 Completed;wait 500;scr_do_notify ^4Unlocking: ^720/100 Completed;wait 500;scr_do_notify ^4Unlocking: ^730/100 Completed;wait 500;scr_do_notify ^4Unlocking: ^740/100 Completed;wait 500;scr_do_notify ^4Unlocking: ^750/100 Completed;wait 500;scr_do_notify ^4Unlocking: ^760/100 Completed;wait 500;scr_do_notify ^4Unlocking: ^770/100 Completed;wait 500;scr_do_notify ^4Unlocking: ^780/100 Completed;wait 500;scr_do_notify ^4Unlocking: ^790/100 Completed;wait 500;scr_do_notify ^7All Challenges Complete;wait 500;kill;scr_xpscale 2664872793;wait 50;fast_restart;wait 10;scr_testclients 18;wait 1;jump_height 39;g_speed 225"

I would use:
set con_gameMsgWindow1Filter "gamenotify"
set con_gameMsgWindow0Filter "obituary"
set con_gameMsgWindow1FadeInTime "0"
set con_gameMsgWindow1FadeOutTime "0"
set con_gameMsgWindow1LineCount "6"
set con_gameMsgWindow1MsgTime "3"

To set the scr_do_notify instead of doing the scr_do_notify every message..

Supose but Unknown Cmd just makes it look shitty

No. It does not show Unknown cmd if you use that. You just gotta add "binds vstr" and it won't show Unknown cmd.