Here is the full list of all 17 Old Adventure achievements.
Complete Level One.
Complete Level Two.
Complete Level Three.
Complete Level Four.
Complete Level Five.
Complete Level Six.
Complete Level Seven.
Complete Level Eight.
Complete Level Nine.
Beat The Boss.
Beat The FinalBoss.
Complete the WindowMode.
Complete the InverseMode.
Complete Jumpy!
Find it!
Complete it!
Finish the Game!