Accomplish the indicated achievement to get the corresponding number of Gamerscore points:

Platypus (10 points): 10 Platypus nests found.
Guardian (15 points): You saved Zora.
The Chosen One (5 points): First Veil passed.
Worshipper (35 points): All Goddess Tears shed in the world collected.
Historian (20 points): All of the Mysteries of Chibi's Herbarium found.
Optimized (35 points): All Dimensional Arts skills purchased.
Who's who? (10 points): Secret identity of the Platypus uncovered.
Puff (10 points): 30 enemies killed with exploding gel.
Achiever (40 points): Met the Goddess at the End of Times. (Initiate mode only)
Botanist (10 points): Wakfu gel used to create 10 Manolias chalices.
Two's a crowd (5 points): Prespic boss defeated in Co-op mode.

Additionally, there is one secret achievement:

Hater (5 points): You destroyed One Manolia.