Here is the full list of all 5 NHL 2K6 achievements worth 1,000 gamerscore. It takes around 1-2 hours to unlock all of the achievements on Xbox 360.
Score a penalty shot on All-Star difficulty or higher.
Score a goal in the first minute of play on All-Star difficulty or higher.
Score a goal when 2 men down on Pro difficulty or higher.
Score a goal with a defenseman on Pro difficulty or higher.
Score a goal on a breakaway on Amateur difficulty or higher.