Here is the full list of all 54 Dakar 18 achievements.
Finish a Dakar 18 stage as Legend
Finish a Dakar 18 stage in first place as Legend
Finish Dakar 18 as Competitor
Finish Dakar 18 in 1st place as Competitor
Drive for 2000 Km with a Car
Finish 1st in every Dakar 18 stages in Peru
Drive for 6000 Km with a SxS
Find every hidden artifact
Find 3 Argentina Soccer Balls
Find all artifacts from Argentina
Find 4 Dulce de Leche from Argentina
Find one Gaucho hat from argentina
Find 2 Bandoneon for Tangos
Find all artifacts from Bolivia
Find one artifact from Argentina
Find 3 Bolivian hats
Find 4 Bolivian humita
Find one Bolivianita Stone (Amentrine gem)
Find 2 Supay (spicy drink and also god of death, ruler of the underworld)
Drive for 2000 Km with a SxS
Find one artifact from Bolivia
Find 3 Pisco Sour
Find all artifacts from Peru
Find 4 Peruvian flutes
Find 2 Golden plates with the Nazca Line of the Monkey
Find 1 Inca sun god "Inti"
Find one artifact from Peru
Beat Patrice Garrouste and its Polaris SxS in the qualifications
Beat Ignacio Casale in its Yamaha Raptor in the qualifications
Beat Eduard Nikolaev and its Kamaz truck in the qualifications
Beat Matthias Walkner and its Ktm in the qualifications
Beat Carlos Sainz in the qualifications
Finish 1st in every Dakar 18 stages in Argentina
Complete an entire Dakar 18 without ever missing a Way Point
Drive for 2000 Km with a Truck
Finish 1st in every Dakar 18 stages in Bolivia
Finish a stage in 1st without any damage
Win three consecutive stages
Finish a Dakar 18 stage in first place
Finish a Dakar 18 stage
Complete a Dakar 18 stage without missing a Way Point
Finish 1st in every Dakar 18 stages in Peru as Legend
Finish 1st in every Dakar 18 stages in Bolivia as Legend
Finish 1st in every Dakar 18 stages in Argentina as Legend
Drive for 2000 Km with a Bike
Drive for 6000 Km with a Bike
Drive for 6000 Km with a Car
Drive for 2000 Km with a Quad
Drive for 6000 Km with a Quad
Drive for 6000 Km with a Truck
Win 3 consecutive stages in Multipler (with bots)
Drive for 10.000 Km in Multiplayer
Finish Dakar 18 as Legend
Finish Dakar 18 in 1st place as Legend