Task Manager opens to Processes tab by default in Windows 8 and 10. If you want it to open to the Startup tab directly, you can do so by creating a special shortcut.
Create a desktop shortcut with the following command-line:
%windir%\system32\Taskmgr.exe /7 /startup
The 1st parameter can be any number, not necessarily 7. But, “/7” is what is used by Msconfig.exe to launch Task Manager.
Related article: What is Startup Impact in Task Manager and How is it Calculated?
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Ramesh Srinivasan founded Winhelponline.com back in 2005. He is passionate about Microsoft technologies and has a vast experience in the ITeS industry — delivering support for Microsoft's consumer products. He has been a Microsoft MVP [2003 to 2012] who contributes to various Windows support forums.