I must have these achievements

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Skipin_Silver_Star34

Can anyone help me to get these achievements.The most help full person will receive a trophy 🏆 

first FIRST 

I know this is achieved by commenting on a daily puzzle.but how to comment on one 

SecDANGEROUS INTERTUSION

Can anyone challenge me for a four player chess game 

Last = INTROSPECTION 

HOW TO USE MY GAMES DATA BASE 

manekapa

Introspection:

See this blog post:

https://www.chess.com/blog/AyushDubey123/get-introspection-achievement-without-premium-membership

BlueHen86

What is an INTERTUSION?