Here is the full list of all 30 Asterix & Obelix: Slap them All! achievements.
Complete Act 6 “The Revenge of Julius Caesar”.
Complete the adventure mode on the Easy difficulty (or higher).
Complete the adventure mode on the Medium difficulty (or higher).
Complete Act 5 “Asterix and Cleopatra”.
Score at least 500,000 points on any mission.
Make the Slap Count climb to over 600.
Complete a mission playing only as Obelix.
Use all of Obelix’s attacks in a single mission.
Use all of Asterix’s attacks in a single mission.
Start a mission in co-op mode.
Send 5 enemies flying with a single uppercut.
Complete Act 4 “Asterix in Corsica”.
Stun 5 enemies at the same time.
Complete Act 3 “Asterix in Spain”.
Knock down 10 enemies with a single throw.
Complete Act 2 “Asterix and the Normans”.
Complete Act 1 “Asterix in Britain”.
Complete a mission playing only as Asterix.
Ram 10 enemies with a single charge.
Complete the first mission.
Complete the adventure mode on the Hard difficulty (or higher).
Complete the adventure mode on the Hardest difficulty.
Complete mission 6-1 "Rally the Galleys" without getting hit even once (Medium difficulty or higher).
Complete Mission 6-8 “Morituri te salutant” without picking up any food (Medium difficulty or higher).
Complete a mission in Freeplay mode.
Destroy all barrels in Mission 5-2 “Risky Business”.
Destroy all barrels in Mission 3-4 “Holding Out in the Hold” in under 35 seconds.
Destroy all objects in Mission 6-5 “Stomping Through Italy” in under 80 seconds.
Send an enemy flying in the air before it ever touches the ground.
Land 40 hits in a row with a single spin with Asterix.