TAL: Arctic 3 (PC)

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Various Steam Achievements

Complete the indicated task to unlock the achievement.

AchievementHow to unlock
Portal 1Complete level 6.
Portal 10Complete level 60.
Portal 2Complete level 12.
Portal 3Complete level 18.
Portal 4Complete level 24.
Portal 5Complete level 30.
Portal 6Complete level 36.
Portal 7Complete level 42.
Portal 8Complete level 48.
Portal 9Complete level 54.