Here is the full list of all 30 Outer Space achievements.
Complete 30th level
Complete 29th level
Complete 28th level
Complete 27th level
Complete 26th level
Complete 25th level
Complete 24th level
Complete 23rd level
Complete 22nd level
Complete 21st level
Complete 20th level
Complete 19th level
Complete 18th level
Complete 17th level
Complete 16th level
Complete 15th level
Complete 14th level
Complete 13th level
Complete 12th level
Complete 11th level
Complete 10th level
Complete 9th level
Complete 8th level
Complete 7th level
Complete 6th level
Complete 5th level
Complete 4th level
Complete 3rd level
Complete 2nd level
Complete 1st level