Do you try to unlock every achievement or do you just play the game?

[Arkk]

If it looks as though it is actually feasible to unlock all of the achievements for a specific game, and I am enjoying the game enough, I will try and go for all 1k. A few examples that I have done this on are Call of Duty 2, Need for Speed Most Wanted, Tomb Raider: Legend, Oblivion, and Bioshock.