Here is the full list of all 48 Time Survivors achievements.
Upgrade Plasma Gun to max level during a run
Reach 25% in the Meta progression
Reach Level 66 with Nik in any stage
Kill 10 T-Rexes
Kill 96 Triceratops
Meet the Mortician
Use the Red Leech for more than 600 seconds in total
Recover 2000 Health Points by any means
Walk 20 Km
Deal a total of 500.000 damage with any fire weapon
Upgrade Slingshot to max level during a run
Kill 1000 scarabs
Defeat 3 Cerberi in a single run
Reach minute 14:40 in The Dark Age stage
Upgrade Telescope to maximum level
Use the Tesla Coil for more than 600 seconds in total
Kill 222 Evil Priests
Find 3 Magic Mushrooms
Upgrade Amoeba to max level during a run
Find 3 Giga Magnets
Meet your first huge monster dog, the Barghest
Death is the way
Play a run in the full "Time Survivors"
Defeat a total of 5000 enemies
Upgrade Ice Orb to max level during a run
Get 5 Apples
Kill 2023 enemies
Survive 6 minutes with Claire
Get 300 gold
Destroy 20 vases
50 Gold turns into 100. Buy upgrades at the Shop!
Reach Level 10 with any character
Reach Level 5 with any character
Deal a total of 1.000.000 damage with the Shuriken
Reach level 16 with Mulan in "The Stone Age" stage
Survive 5 minutes with Ned
Complete the Egypt Age stage
Reach Level 10 with Ned
Complete "The Egypt Age" stage
Complete "The Dark Age" stage
Upgrade Shuriken to max level during a run
Survive 20 minutes with Ned
Kill the flying Pyramid
Survive 20 minutes as Cleo
Reach 50% in the Meta progression
Reach 75% in the Meta progression
Reach 100% in the Meta progression
Reach minute 5:55 in The Ice Age stage