Best practices with steam functions

[obscene]

Curious as to whether there are any important things to do regarding steam. For instance to award an acheivement I realize you do this...

//pseudocode
if !get achievement  set achievement

But should I also be doing this?

//pseudocode
if steam_initialised()
  {
  if !get achievement  set achievement 
  }

Or even this?

//pseudocode
if steam_initialised()
  {
     if steam_is_user_logged_on();
     {
     if !get achievement  set achievement
     }
  }

I would think there are a few things like this to know, but really from the manual all I can understand are how to use the functions individually.

 

[CoderJoe]

I would check on some tutorials regarding steam. I personally have never used the functions but I would assume you are correct in checking things first.