Cookie Clicker with Python version 0.0.5

#Simple Clicker Game! version 0.0.5
#Code by GameNationRDF Have fun :) ..
#More achievements to be added in the future updates!
#GUI is Work In Progress..

from tkinter import *
import time

master = Tk()

click = 0
mult = 1

def blankLine():
    for i in range(23):
        print ("")

def purchaseDoubleClicksCommand():
    global click
    global mult
    if click < 750:
        print ("Not enough clicks!")
        blankLine()
    if click >= 750:
        mult = mult*2
        click = click - 750
        print ("Double Clicks Purchased!")
        blankLine()

def buttonCommand():
    global click
    global mult
    click += 1*(mult)
    print (click)
    blankLine()

    #Acihevements and Bonus clicks

    if click == 100:
        print ('''Achievement Unlocked: Junior Clicker!
    BONUS 100!''')
        click += 100

    elif click == 400:
        print ('''Achievement Unlocked: Little Ninja Clicks!
    BONUS 200!''')
        click += 300

    elif click == 900:
        print ('''Achievement Unlocked: Legit Ninja!
    DOUBLE CLICKS!''')
        mult = mult * 2

    elif click == 1500:
        print ('''Achievement Unlocked: Click Ninja Master!
    QUAD CLICKS!''')
        mult = mult * 4

    elif click == 3000:
        print ('''Achievement Unlocked:  Jackie Chan Style!
    8 TIMES THE CLICKS!''')


mainClickButton = Button(master, text="Click!", command=buttonCommand)
mainClickButton.pack()

purchaseDoubleClickButton = Button(master, text="Purchase Double Clicks", command = purchaseDoubleClicksCommand)
purchaseDoubleClickButton.pack()

master.title("Clicker! v0.0.5")
master.geometry("%sx%s+%s+%s" % (200,70,512,512))
mainloop()

#Changelog:

        # -New Double click purchasing mechanic added.
        # -Compacter & efficient code!
        # -Little adjustments on click/achievements to balance the game out.