Garry's Mod

1. Navigate to <path-to-game>
2. Create a .bat file
3. Paste in the following code:

@ECHO OFF

for /L %%i IN (1, 1, 1000) DO (
	start "" "hl2.exe" -noborder -windowed -novid -nosound -nojoy -noipx -nopreload -nod3d9ex -low -textmode -insecure +sv_lan 1 +map gm_flatgrass +achievement_debug 1
	echo Started %%i times
	timeout /t 7 /nobreak
	taskkill /f /im "hl2.exe"
)

pause

4. Save
5. Double click the batch file to run it

This will open and close the game in it's minimal, low power state 1,000 times. It will remain open for 7 seconds, which should be enough time for it to increment the "Achievement count increased for GMA_X_STARTUPS: x/1000" counter, as well as tell you how many times it has opened the game.

This will take ~2 hours to complete if you've never launched the game before.

1. Navigate to <path-to-game>\garrysmod
2. Create a .bat file
3. Paste in the following code:

@ECHO OFF

for /L %%i IN (1, 1, 1000) DO (
	start "" "hl2.exe" -noborder -windowed -novid -nosound -nojoy -noipx -nopreload -nod3d9ex -low -textmode -insecure +sv_lan 1 +map gm_flatgrass +achievement_debug 1
	echo Started %%i times
	timeout /t 7 /nobreak
	taskkill /f /im "hl2.exe"
)

pause

4. Save
5. Double click the batch file to run it

This will open and close the game in it's minimal, low power state 1,000 times. It will remain open for 7 seconds, which should be enough time for it to increment the "Achievement count increased for GMA_X_STARTUPS: x/1000" counter, as well as tell you how many times it has opened the game.

This will take ~2 hours to complete if you've never launched the game before.