Here is the full list of all 22 Evorales achievements.
Get all medal "S" in one level.
Get at least 15 medals "S" in a game.
Get all medal "F" in one level.
Find the 6 hidden parts of the wildebeest medallion.
End a game without continuing.
Finish a game on enjoyable difficulty.
Finish a game on arcade difficulty.
Finish a game on nightmare difficulty.
Finish a game, descending to the Gnu-underworld.
Get an extra life for points.
Get two extra lives for points.
Get three extra lives for points.
Unlock Fernando's aircraft.
Unlock Ariel's aircraft.
Reach Atacama level boss.
Reach Gnuferno level boss.
Score 50M points in one game.
Score 5 million points in the same chain combo.
Finish Marathon mode without continues.
finish game with: No miss - 50M - 15 "S" medals
Score 75M points in one game.
Score 100M points in one game.